Algorithm: for finding "Tamil date month and year"?

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?

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Aug 2, 2019, 11:02:06 AM8/2/19
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"Tamil date month and year"?

If I give an English date How do we find the Tamil date and month and year?

Is any research was done based on this scenario?

Any information related to this is highly  appreciated.

Thanks in advance.

Ravi Annaswamy

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Aug 2, 2019, 11:46:54 AM8/2/19
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I can research this if no solution already exists

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Innamburan S.Soundararajan

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Aug 2, 2019, 11:58:52 AM8/2/19
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If I give the Tamil date, can the English date be given?


இன்னம்பூரான்






இன்னம்பூரான்

http://innamburan.blogspot.co.uk

http://innamburan.blogspot.de/view/magazine

www.olitamizh.com




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?

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Aug 2, 2019, 12:21:50 PM8/2/19
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no solution already exists. 

so any one can start the research. can start an open source project may be in any familiarised computer language.

I am amazing, still we didn't standardised this Tamil calendar dilemma.

Tamil society made lot of conferences but they are not concentrate the important one their tamil date. already some solutions available for Korean lunar calendar and Chinese calendar. but no solution available for Tamil calendar.


On Friday, 2 August 2019, Ravi Annaswamy ravi.an...@gmail.com [isaiyini] <isai...@yahoogroups.com> wrote:

I can research this if no solution already exists

Sent from my iPhone

On Aug 2, 2019, at 11:01 AM, ? <pitchaim...@gmail.com> wrote:

"Tamil date month and year"?

If I give an English date How do we find the Tamil date and month and year?

Is any research was done based on this scenario?

Any information related to this is highly  appreciated.

Thanks in advance.

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?

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Aug 2, 2019, 12:27:01 PM8/2/19
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both are same question. 

we can make a formulae to calculate the Tamil date. any body aware of how the tamil calendar date was made for very year?


On Friday, 2 August 2019, 'Innamburan S.Soundararajan' innam...@gmail.com [isaiyini] <isai...@yahoogroups.com> wrote:

If I give the Tamil date, can the English date be given?


இன்னம்பூரான்






இன்னம்பூரான்

http://innamburan.blogspot.co.uk

http://innamburan.blogspot.de/view/magazine

www.olitamizh.com




On Fri, Aug 2, 2019 at 9:16 PM Ravi Annaswamy <ravi.an...@gmail.com> wrote:
I can research this if no solution already exists

Sent from my iPhone

On Aug 2, 2019, at 11:01 AM, ? <pitchaim...@gmail.com> wrote:

"Tamil date month and year"?

If I give an English date How do we find the Tamil date and month and year?

Is any research was done based on this scenario?

Any information related to this is highly  appreciated.

Thanks in advance.

--
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தேமொழி

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Aug 2, 2019, 2:37:03 PM8/2/19
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இணையத்தில் பஞ்சாங்கம்/Month Panchang  என்று தேடிப்பாருங்கள் இசையினியன், கிடைக்கும் 

பெரும்பாலும் ஜோதிடத்திற்காக உருவாக்கப்படும் மென்பொருள்கள் மூலமும்  கிரிகாரியன் தேதிக்குத் தமிழ் மாதம் தேதி பெறலாம்.

எடுத்துக்காட்டாக, https://www.drikpanchang.com/panchang/month-panchang.html  << இங்கு திருக்கணித பஞ்சாங்கம் கிடைக்கிறது, இதை நான் வரலாற்று நோக்கில் தமிழ்த் திங்கள், நாள் என அறியப் பயன் படுத்தியுள்ளேன்.  இங்கு 1600 ஆண்டு முதல் தகவல் பெறலாம்.

மேலும் தேவையானால், ஜகந்நாத ஹோரா என்ற மென்பொருளைத் தரவிறக்கியும் பயன் பெறலாம். http://www.vedicastrologer.org/jh/ << அதில் இன்னமும் பத்தாயிரம் ஆண்டுகளுக்கும் மேலாக (12899 BC-16900 AD)   பின்னோக்கியும் முன்னோக்கியும் செல்ல வாய்ப்புள்ளதாகத் தெரிகிறது. இதையும் நான் பயன்படுத்தியுள்ளேன். 


Ravi Annaswamy

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Aug 2, 2019, 5:19:13 PM8/2/19
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If someone can give me 10 different dates spread across 1900 to 2019 in English as well as corresponding Tamil year month day I can create open source code and use this data to make sure requirements are correct

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தேமொழி

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Aug 2, 2019, 7:40:47 PM8/2/19
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On Friday, August 2, 2019 at 2:19:13 PM UTC-7, Ravi Annaswamy wrote:
If someone can give me 10 different dates spread across 1900 to 2019 in English as well as corresponding Tamil year month day I can create open source code and use this data to make sure requirements are correct

///  10 different dates spread across 1900 to 2019 in English as well as corresponding Tamil year month day  ///

But...!!!!
is that sufficient enough???
I've gleaned data for 25 dates.

Some Memorable Dates of - 
Indian Independence movement (1857-1947) ...  and India after Independence
1.
May 10, 1857 - Indian Rebellion of 1857
[29, Chithirai
Krishna Paksha, Pirathamai
1779 Shaka, Kaliyugam 4958]

2.
Dec 28, 1885 - The formation of the Indian National Congress
[15, Maargazhi
Krishna Paksha, Astami
1807 Shaka, Kaliyugam 4986]

3.
Oct 16, 1905 - Partition of Bengal
[31, Purattaasi
Krishna Paksha, Thiruthiyai
1827 Shaka, Kaliyugam 5006]

4.
Dec 30, 1906 - The formation of Muslim League
[16, Maargazhi
Shukla Paksha, Pournami
1828 Shaka, Kaliyugam 5007]

5.
Jan 9, 1915 - The Advent of Mahatma Gandhi
[26, Maargazhi
Krishna Paksha, Astami
1836 Shaka, Kaliyugam 5015

6.
Dec 29, 1916 - Lucknow Pact
[15, Maargazhi
Shukla Paksha, Panjami
1838 Shaka, Kaliyugam 5017]

7.
Mar 18, 1919 - Rowlatt Satyagraha
[05, Panguni
Krishna Paksha, Thuthiyai
1840 Shaka, Kaliyugam 5019]

8.
April 13, 1919 - Jallianwala Bagh massacre
[31, Panguni
Shukla Paksha, Thirayodasi
1841 Shaka, Kaliyugam 5020]

9.
Jun 28, 1919 - The Khilafat movement
[14, Aani
Shukla Paksha, Pirathamai
1841 Shaka, Kaliyugam 5020]

10.
Sep 28, 1920 - Non-Cooperation Movement
[13, Purattaasi
Shukla Paksha, Pournami
1842 Shaka, Kaliyugam 5021]

11.
Mar 12, 1930 - Civil Disobedience
[29, Maasi
Shukla Paksha, Duvadasi
1851 Shaka, Kaliyugam 5030]

12.
October 15, 1931 - Birth of A. P. J. Abdul Kalam
[29, Purattaasi
Shukla Paksha, Panjami
1853 Shaka, Kaliyugam 5032]

13.
August 15, 1947 - India  independence 
[31, Aadi
Krishna Paksha, Sathuradasi
1869 Shaka, Kaliyugam 5048]

14.
October 27, 1947 - India and Pakistan go to war
[11, Aippasi
Shukla Paksha, Thirayodasi
1869 Shaka, Kaliyugam 5048]

15.
January 30, 1948 - Mahatma Gandhi- assassinated
[17, Thai
Krishna Paksha, Panjami
1869 Shaka, Kaliyugam 5048]

16. 
January 26, 1950 - India becomes a republic
[13, Thai
Shukla Paksha, Astami
1871 Shaka, Kaliyugam 5050]

17.
May 18, 1974 - India conducts underground nuclear test
[04, Vaikaasi
Krishna Paksha, Egadashi
1896 Shaka, Kaliyugam 5075]

18.
June 26, 1975 - Indira Gandhi declares a state of emergency
[12, Aani
Krishna Paksha, Thiruthiyai
1897 Shaka, Kaliyugam 5076]

19.
October 31, 1984 - Indira Gandhi is assassinated
[15, Aippasi
Shukla Paksha, Astami
1906 Shaka, Kaliyugam 5085]

20.
May 21, 1991 - Rajiv Gandhi is assassinated
[07, Vaikaasi
Shukla Paksha, Astami
1913 Shaka, Kaliyugam 5092]

21.
December 6, 1992 - Hindu zealots tear down a mosque  Ayodhya
[21, Karthikai
Shukla Paksha, Egadashi
1914 Shaka, Kaliyugam 5093]

22.
March 12, 1993 - A series of bomb blasts-Bombay
[29, Maasi
Krishna Paksha, Panjami
1914 Shaka, Kaliyugam 5093]

23.
July 27, 2015 - Death of A. P. J. Abdul Kalam
[11, Aadi
Shukla Paksha, Egadashi
1937 Shaka, Kaliyugam 5116]

24.
Aug 15, 2016 -70th Independence day of India
[31, Aadi
Shukla Paksha, Duvadasi
1938 Shaka, Kaliyugam 5117]

25.
July 22, 2019 -  Chandrayaan-2 launch
[06, Aadi
Krishna Paksha, Panjami
1941 Shaka, Kaliyugam 5120]





 

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On Aug 2, 2019, at 2:37 PM, தேமொழி <jsthe...@gmail.com> wrote:

இணையத்தில் பஞ்சாங்கம்/Month Panchang  என்று தேடிப்பாருங்கள் இசையினியன், கிடைக்கும் 

பெரும்பாலும் ஜோதிடத்திற்காக உருவாக்கப்படும் மென்பொருள்கள் மூலமும்  கிரிகாரியன் தேதிக்குத் தமிழ் மாதம் தேதி பெறலாம்.

எடுத்துக்காட்டாக, https://www.drikpanchang.com/panchang/month-panchang.html  << இங்கு திருக்கணித பஞ்சாங்கம் கிடைக்கிறது, இதை நான் வரலாற்று நோக்கில் தமிழ்த் திங்கள், நாள் என அறியப் பயன் படுத்தியுள்ளேன்.  இங்கு 1600 ஆண்டு முதல் தகவல் பெறலாம்.

மேலும் தேவையானால், ஜகந்நாத ஹோரா என்ற மென்பொருளைத் தரவிறக்கியும் பயன் பெறலாம். http://www.vedicastrologer.org/jh/ << அதில் இன்னமும் பத்தாயிரம் ஆண்டுகளுக்கும் மேலாக (12899 BC-16900 AD)   பின்னோக்கியும் முன்னோக்கியும் செல்ல வாய்ப்புள்ளதாகத் தெரிகிறது. இதையும் நான் பயன்படுத்தியுள்ளேன். 







On Friday, August 2, 2019 at 8:02:06 AM UTC-7, இசையினியன் wrote:
"Tamil date month and year"?

If I give an English date How do we find the Tamil date and month and year?

Is any research was done based on this scenario?

Any information related to this is highly  appreciated.

Thanks in advance.

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Ravi Annaswamy

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Aug 2, 2019, 8:29:16 PM8/2/19
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Thank you so much தேமொழி அவர்களே.

You are right: To *design* the algorithm 20 data points may not sufficient, but I requested them only to evaluate the result matches your expectation/definition. I will share the calculator logic in plain English or probably in a spreadsheet.

I really love how you have used this prompt to snapshot history (set exact milestones not arbitrary dates.) double thanks.

Will work on this today tomorrow.
Ravi

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Ravi Annaswamy

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Ravi Annaswamy

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இசையினியன்

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Aug 2, 2019, 10:21:37 PM8/2/19
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in the given example why Shaka come?

Shaka year is totally different from Tamil Calculation.

Shaka and Tamil calendar are not same. My statement is Right.? or wong?
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இசையினியன்

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Aug 2, 2019, 10:23:41 PM8/2/19
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Ravi,

In school notebook back side they provide the tables to know the Weekday for any year, date, month. Is there any logic behind that?
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தேமொழி

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Aug 2, 2019, 10:27:18 PM8/2/19
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On Friday, August 2, 2019 at 7:21:37 PM UTC-7, இசையினியன் wrote:
in the given example why Shaka come?

அது அரசு அங்கீகரித்த தேசிய நாட்கணக்கிடும் முறையின் கீழ் இடம்பெறுகிறது


Indian national calendar
From Wikipedia, the free encyclopedia


Mohar of Gorkha king Prithvi Narayan Shah dated Saka era 1685 (AD 1763).

The Indian national calendar, sometimes called the Shalivahana Shaka calendar. It is used, alongside the Gregorian calendar, by The Gazette of India, in news broadcasts by All India Radio and in calendars and communications issued by the Government of India.[1] The Saka calendar is also used in Java and Bali among Indonesian Hindus. Nyepi, the "Day of Silence", is a celebration of the Saka new year in Bali. Nepal's Nepal Sambat evolved from the Saka calendar. Prior to colonization, the Philippines used to apply the Saka calendar as well as suggested by the Laguna Copperplate Inscription.

The term may also ambiguously refer to the Hindu calendar; the Shalivahana era is also commonly used by other calendars.

இசையினியன்

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Aug 2, 2019, 10:28:03 PM8/2/19
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I think dont involve in more complexity in calculating like nakchatra, etc.. try simple one.

like

English date ==> TaAlgorithm ==> Tamil date

TaAlgorithm there should be calculation like English right?



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தேமொழி

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Aug 2, 2019, 10:35:17 PM8/2/19
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This Math Trick Will Let You Find The Day Of The Week For Any Date


One of my fellow contributors here recently wrote a post about leap years and why we have them. This reminded me of modular arithmetic and the formula for calculating the day of the week for any date in history.

We use modular arithmetic all the time. It's useful for situations where you want to start over, time being the most obvious. Say it's 9 o'clock. What time will it be 5 hours from now? Unless you're in the military you'd say 2 o'clock, right? That's modular arithmetic, the modulus being 12. To add hours, we simply add them together: 9+5=14, and then subtract 12 to get 2. Months work the same: 12 months means that 5 months after September is the second month of the next year (February). Ditto for minutes (modulo 60) and hours (arithmetic modulo 60).

In general, given a positive integer n, we have the relation of congruence modulo n: an integer a is equivalent to its remainder when divided by n. So there are only n distinct classes of integers modulo n, namely the n remainders 0,1,2,...(n-1). We can add these together just like we do hours or months, subtracting off n if the sum of two remainders exceeds n.

Arithmetic modulo 2 is all about odd vs. even. The even integers correspond to remainder 0 when dividing by 2, and the odds have remainder 1 when dividing by 2. The two remainders may then be added, keeping in mind this relationship: 0+0=0, 0+1=1, 1+0=1, 1+1=0. That last one happens because 1+1=2, and so we subtract 2 to get the right remainder class (0). These sums are simply a formal algebraic way of saying that even + even = even, odd + even = odd, and odd + odd = even. Computers use mod 2 addition all the time since they store numbers in binary.

So what about days of the week? That is arithmetic modulo 7 of course and there is a formula that will give you the day of the week for any date in history. It's called Zeller's formula and here it is:

zeller

The various terms are defined as follows: d is the day of the week, where 0 = Sunday, 1 = Monday ... 6 = Saturday; k is the day of the month; D is the last two digits of the year; C is the century, obtained as the first two digits of the year. The brackets [ • ] correspond to the greatest integer function, which is the largest integer less than or equal to the number inside. So, for example [π]=3. The number m is the month, but there's a catch: we start counting with March = 1 so that January and February are the 11th and 12th months of the previous year.

Let's do some examples. I'll pick a date we know: December 7, 1941 was a Sunday. The corresponding numbers are: k = 7, D = 41, C = 19, m = 10. Then we get

pearl

So that one works. How about January 13, 2045?

jan13

I chose that date at random, and it turned out to be a Friday the 13th. Odd. Note the shift in years since January of 2045 is the 11th month of 2044 under this scheme.

Note that this formula only works for the Gregorian calendar, instituted by Pope Gregory VIII in 1582. Before that the Julian calendar was in effect. The protestant world resisted adoption of a Catholic innovation; indeed, the British empire (including the U.S.) didn't switch to the Gregorian calendar until 1752. The difference involves how leap years get tabulated; the Julian calendar made every fourth year a leap year, leading to an overcompensation for the extra few hours more than 365 days a year actually is. The Gregorian calendar fixes this by making years divisible by 100 non-leap years, unless the year is divisible by 400 in which case it is a leap year (so, 2000 was a leap year, but 2100 will not be). There is a Julian calendar formula that is similar.

By now you've calculated the day of the week on which you were born (mine is a Tuesday) and maybe a few others. This formula isn't too difficult to memorize if you want to bore amaze your friends at parties. Enjoy!

I am a professor of mathematics at the University of Florida ..........

இசையினியன்

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Aug 2, 2019, 10:40:52 PM8/2/19
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This thread is for tamil calendar caluculation. Tamil calendar uses two era
  1. one is chithrai based
  2. another one is Thiruvalluvar based
Shalivahana era is not part of Tamil Calendar calculation? 

தேமொழி

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Aug 2, 2019, 10:49:16 PM8/2/19
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அந்தக் குழப்பத்தில் இறங்கினீர்கள் என்றால் நீங்கள் காணாமல் போவீர்கள்.

தமிழில் எந்த மாதம் என்ன நாள் என்பதையே யாரும் தமிழில் நடைமுறையில் பயன் கொள்வதில்லை.

இன்று தமிழில் என்ன மாதம் என்ன நாள் என்று தேடாமல் எத்தனை பேர் சொல்வார்கள்?

மாதம் பெயரும் நாளும் மாறாது எனக் கொள்வோம் (வழக்கமாக தமிழகத்தில்  கணக்கிடும் முறையின்படி)

ஆண்டின் துவக்கத்தை எந்த மாதத்தில் வைத்தாலும் மாதமும் நாளும் மாறாது. 

சக, விக்கிரம, கலி, கொல்லம் என   எல்லாவற்றையும் கைவிட்டுவிடுதலே நலம். 

தேமொழி

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Aug 2, 2019, 10:50:24 PM8/2/19
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பட்டியலில் விடுபட்ட திருவள்ளுவரையும் சேர்த்துக்  கொள்ளவும் 

இசையினியன்

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Aug 2, 2019, 10:54:57 PM8/2/19
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Right.

Let tell a mathematics formula to get a Tamil date for an English date? We will deal other matters after this. Do you have Have any clue for the formula?

Ravi Annaswamy

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Aug 2, 2019, 11:02:25 PM8/2/19
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Will study this tonight and share my finding or formula 

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தேமொழி

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Aug 2, 2019, 11:03:51 PM8/2/19
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இல்லை ... எனக்கு கணிதம், கணினி போன்றவற்றுக்கு எழுதப்படும் சூத்திரம்   நிரல்கள் இவற்றில்  பழக்கமில்லை.  அது எனது துறையுமல்ல.

ஆனால், ஏற்கனவே கணக்கிட்டு வழங்கும் வசதி ஒன்று இருக்கும்பொழுது, அதுவும்  விலையின்றி அனைவருக்கும் கிடைக்கும்பொழுது  நீங்களும் ஒன்று உருவாக்க விரும்பும் நோக்கம்தான்  எனக்குப் பிடிபடவில்லை.

சக்கரத்தை மீண்டும் கண்டுபிடிக்க விரும்புவதன்  நோக்கம்?

?

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Aug 2, 2019, 11:11:12 PM8/2/19
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The purpose of the formula is:

Ok let i tell in detail. My need is create a jquery plug-in for Tamil year. For English calendar already exists, go to this site https://jqueryui.com/datepicker/

like this we create a plug-in for Tamil calendar. If we done means it will decorate all Tamil web-pages easily. Also we may display the calendar in every browser for Tamil people. Right.



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?

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Aug 2, 2019, 11:21:42 PM8/2/19
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Ravi,

Also try to find this question. Tamil calendar is a 
  1. Solar calendar?
  2. Lunar calender?
  3. LuniSolar Calendar?
I hope this is starting point for Tamil calendar formula. But i don't know how to start.

Is ther any database available to public from ISRO or any Indian institution; like the moon rotation position, full moon, dark moon .


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Ravi Annaswamy

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Aug 3, 2019, 12:48:25 AM8/3/19
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Iniyan Sir


Great question.

Tamil calendar is Solar calendar.
(Malayalam too), since the month starts when Sun shifts to a new Rasi.

Telugu calendar is Luni-solar.

Found this great resource "South Indian Chronological Tables" published 1889 by Krishnaswamy Naidu.

It has 4 Tables and worked example for finding Tamil Year, Month and day for English date March 30, 1804 -> Rudrothkari Panguni 20

I am trying to first use the tables, but also there should be easier way to code the tables themselves computationally.


Ravi


On Friday, August 2, 2019 at 11:21:42 PM UTC-4, இசையினியன் wrote:
Ravi,

Also try to find this question. Tamil calendar is a 
  1. Solar calendar?
  2. Lunar calender?
  3. LuniSolar Calendar?
I hope this is starting point for Tamil calendar formula. But i don't know how to start.

Is ther any database available to public from ISRO or any Indian institution; like the moon rotation position, full moon, dark moon .


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Ravi Annaswamy

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Aug 3, 2019, 2:25:36 AM8/3/19
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Using Krishnaswamy Naidu lookup tables, I am able to convert

the first date from  Themozhi Madam's test cases - May 10, 1857

1. From table C:
1857 April 11 was first day of Kali 4959 - Pingala varusham.
It was 101th day of the english year and serial number 0

2.From Table B, the date count of May 10 is 130 from beginning of year.

3. Subtract 101 from 130 gives 29 days.

4. From Table A, this falls in Chittirai and 29. 

SUCCESS!

Let me check a few more dates, first by hand, to get an intuition, 
and try to either see how to avoid look up tables by figuring out pattern in the tables?

I also have python code for calculating planetary positions and ideally sun position should give
tamil month and date, but since the calendar is an approximation and uses integer conversion, 
they adjust using different days for some months.

We have to program the conventions from an earlier era or use lookup tables. Let me think some more.

Time to get some sleep.
Ravi

Ravi Annaswamy

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Aug 3, 2019, 2:35:13 AM8/3/19
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Since one example is not considered SUCCESS, I tried the second date

1885 December 28 - given Markazhi 15

====

From Table C: year began on 12th April - 102th day of english year., Serial number 1.
From Table B: December 28 is the 362th day of the year
Subtract 362-102=260, add serial 1=261
From Table A: 246 days are accounted until Karthigai.
Remaining 15 days in Markazhi.

Markazhi 15.

SUCCESS.

Now I can think of coding the look up tables. I have some idea to make it simpler.
--

One discrepancy, According to Naidu tables, Kali year is 4987 not 4986 so either my understanding of his rules are wrong or he is wrong or the webpage is wrong,
will investigate.

Ravi

nkantan r

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Aug 3, 2019, 8:15:01 AM8/3/19
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I started reading the thread today. What is a 'Tamil' date and what is an 'English' date?

I like Arab(ic) dates as well seedless Lion's dates

rnk

Ravi Annaswamy

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Aug 3, 2019, 3:29:45 PM8/3/19
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That is also possible
I will try to implement both mappings in few days

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சேதுராமன்

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Aug 4, 2019, 12:08:35 AM8/4/19
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நன்றேசெய்வீர்.சுக்கிலபட்சம்\கிருட்டினபட்சம் என்பனவற்றைமாற்றித்தமிழில்வெண்பக்கம்\கரும்பக்கம்என்றாக்குவீர்.

nkantan r

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Aug 4, 2019, 1:19:57 AM8/4/19
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வளர்பிறை, தேய்பிறை எனும் சொற்களிக்கும்போது..?

English date என்றால் என்ன, Tamil date என்றால் என்ன? அதை முதலில் குழப்பமில்லாமல் கூறுங்கள்..

rnk

?

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Aug 4, 2019, 7:07:52 AM8/4/19
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Krishnaswamy Naidu lookup tables avail for public or where can we see?

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?

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Aug 4, 2019, 7:11:30 AM8/4/19
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those things is consider after the first thing is achieved.

English date ==> TAAlgorithm ==> Tamil date.

wee need to achieve this first.

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?

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Aug 4, 2019, 7:20:42 AM8/4/19
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I went the above link. But i am not clear to locate the need book / needed details. Please tell us, how can we use this website. any related book is available? If avail means please tell the correct link for the book.

On Sat, 3 Aug 2019 at 12:55, raman selvaraj rajse...@yahoo.com [pmadurai] <pmad...@yahoogroups.com> wrote:
 


https://www.revolvy.com/page/Sivagurunathan-Tamil-Library?cr=1
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Sent from myMail for Android Saturday, 03 August 2019, 11:57AM +05:30 from R.Navaneethakrishnan' kol...@gmail.com [pmadurai] pmad...@yahoogroups.com :

> 
>It is possible to get it from any 'Panchangam' web sites. There are a few Vakya Panchangam or Thirukkanitha Panchangam web sites available..
>
>On Fri, 2 Aug, 2019, 9:36 PM '?' pitchaim...@gmail.com [pmadurai], < pmad...@yahoogroups.com> wrote: > "Tamil date month and year"?
>> *If I give an English date How do we find the Tamil date and month and > year?*

>> Is any research was done based on this scenario?
>> Any information related to this is highly appreciated.
>> Thanks in advance.

>> [Non-text portions of this message have been removed] >>
>> ------------------------------------
>

[Non-text portions of this message have been removed]

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Ravi Annaswamy

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Aug 4, 2019, 7:36:41 AM8/4/19
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Sorry I thought I had provided link

Here it is
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Ravi Annaswamy

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Aug 4, 2019, 7:39:32 AM8/4/19
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English date is Gregorian year month date
Eg 2019 April 14
Tamil date is விகாரி சித்திரை 1

Please see Themozhi 25 date test set in first few messages

Sent from my iPhone

On Aug 4, 2019, at 7:20 AM, ? <pitchaim...@gmail.com> wrote:

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?

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Aug 4, 2019, 7:49:34 AM8/4/19
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Page 1 there is a table called "Table A" 

Can you tell me where can i see the Table B and C

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Ravi Annaswamy

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Aug 4, 2019, 8:01:40 AM8/4/19
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Krishnaswamy Naidu - South Indian Chronological tables
has the tables and procedures fro converting from AD-date to Tamildate and reverse.



Robert Sewell and Shankar Balkrishna Dixit - Indian Calendar
Seems to have better formatted table and more information and thorough description of 
seemingly a better method, (he refers to Naidu method as quick approximate way) 


Eclipse and other calculations

Indian Calendric System
Govt of India book on calendars.

===

Please see my earlier two threads with examples of converting two dates using Naidu tables.
Today I will try to make some time to work on this and provide an excel version of the table if possible.
I wanted to avoid the look up table and use astronomical calculation, but have not found the key or logic on
why same Tamil month may have different days. That is Tamil calculation is not standard leap year once in four year,
instead it alternates, it can be in 3 year or 4 year. Also I found out that Tamil months are Nirayana, so Chithirai has shifted from
March to April over a thousand years!


==

Themozhi's question on why reinvent the wheel - Iniyan has answered that it is for new usecases.

 My answer (not arrogant) stance is reinventing the wheel and rediscovering the solar system are
ways to truly understand. That is the use.

Rediscovering (calculating for yourself) is one way to understand the subject thoroughly.
Ravi

Ravi Annaswamy

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Aug 4, 2019, 8:12:49 AM8/4/19
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Ravi Annaswamy

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Aug 4, 2019, 8:33:05 AM8/4/19
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Table B is on page 8

Table C is on page 10

Method from English->Tamil is on page 7a
Method from Tamil -> English is on page 5

The rules themselves on page 4.

This is a short book, so better to read it end to end.

Sewell/Dixit is thorough and exhaustive, and may be accurate.

I think I got the idea on why some days get shifted. There is no concept of leap adjustment. 
If the month beginning (sun entering a Rasi) happens after sunset,
then the month beginning is moved to next day! This is the one that can allow us not to need look up table, let me try.

Ravi

?

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Aug 4, 2019, 8:35:13 AM8/4/19
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Chronological tables
Table A
Part I
 Part II
 Part III
Solar Year
 Luni-Solar Year
 Hijra Year
Months
 Collective duration
 Months in their order of successive in ordinary year
 Collective Duration
 Months
 Collective Duration
Serial Number
 Tamil Name
 Malayalam equivalent
 Serial Number
 Telugu Name
 Tulu equivalent Serial Number
 Name
1
 2
 3
 4
 1
 2
 3
 4
 1
 2
 3
1
 Siththirai
 Modam
 31
 1
 Chaitru
 Paggu
 30
 1
 Mohram
 30
2
 Vaiyassi
 Edavam
 62
 2
 Vaisakka
 Besa
 59
 2
 Safur
 59
3
 Ani
 Midunam 94
 3
 Jeshtha
 Kartelu
 89
 3
 Rabi al awwal
 89
4
 Adi
 Karkadakam 125
 4
 Ashadha
 Ati
 118
 4
 Rabiu s sani
 118
5
 Avani
 Chingam 156
 5
 Srvana
 Sonu
 148
 5
 Jamadi l awwal
 148
6
 Purttasi
 Kanni 187
 6
 Bhadrapada
 Nirnala
 177
 6
 Jamadi u s  sani
 177
7
 Aippasi
 Thulam 217
 7
 Asvayuja
 Bontelu
 207
 7
 Rajab
 207
8
 Karthikai
 Virichikam 246
 8
 Kartika
 Jarde
 236
 8
 Shuban
 236
9
 Markali
 Dhanu 276
 9
 Margasirm
 Perarde
 266
 9
 Ramazan
 266
10
 Thai
 Makram
 305
 10
 Pushya
 Puntelu
 295
 10
 Shawwal
 295
11
 Maasi
 Kumpam
 335
 11
 Magha
 Mayi
 325
 11
 Zhul qa dah 325
12
 Panguni
 Minam
 365
 12
 Phalguna
 Suggi
 354
 12
 Zul hasa
 354




13
 In intercalary year In intercalary year 384
In intercalary year
 355

Table B and Table C need to update.

?

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Aug 4, 2019, 8:36:46 AM8/4/19
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Table B and C need update

?

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Aug 4, 2019, 8:45:12 AM8/4/19
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Ravi where we put leaf year extra one day... Which Tamil month?

In this Table A only 365 days are available right? If year has 366 means? the extra day goes where? Which Tamil month?

?

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Aug 4, 2019, 8:58:38 AM8/4/19
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Ravi,

Excel created at Google shared document?

If you created the Excel for the table and C? Or have the details at Google document? If have means share us.

Or else need to create means tell i will create.


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Aug 4, 2019, 9:05:05 AM8/4/19
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We will put Themozhi given cases at the test cases for the calculation. 

we create one sheet (Test Cases) for that in the shared Google Excel document. Right!

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Ravi Annaswamy

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Aug 4, 2019, 9:16:51 AM8/4/19
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Wow how did you convert table A as html table
Nice

No I have not converted table B or C to excel

Instead I am thinking to infer a rule to avoid them. 

That is we need a formula to generate table C which essentially shows on what day  Tamil new year (mesha sankranti) will fall and how
Manyth day of English year it will be.

Also In Tamil there is no concept of leap year but shifting of days to next morning if Surya Pravesam happens after sunset




Sent from my iPhone

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Aug 4, 2019, 9:36:38 AM8/4/19
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using seemonkey i created the html table. Raw typing method follows. 

Ok let allow to create the excel sheet on google shared document, First we finish the accurate method of chronological tables based caluculation.

see already created software for year 2018 availt  https://thanithamizhakarathikalanjiyam.github.io/ttak_date_time. before testing computer set to 2018 year. But this project is droped, due to lack of knowledge about Tamil calendar.

The source code available at,

So first we should walk through the knowledge base first. Simple logic is needed. if we create a jquery plugin like https://jqueryui.com/datepicker/



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Ravi Annaswamy

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Aug 4, 2019, 9:45:44 AM8/4/19
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Very nice to know about seemonkey

So you feel we should first implement Naidu tables? 
I can progtammatize table a and b easily and we can probably input table c from 1850 to 2050

—

True we cannot do calendar without implementing astronomy

Actually the Tamil solar calendar is easy because 
It is no adjusted (nirayana) and only needs sun and earth calculation

What complicates is adding the sunset test
Let me
Work some
More



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?

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Aug 4, 2019, 10:05:08 AM8/4/19
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YES, we first finish approximate chronological method (says Naidu method); 
then try accurate method 
then we may compare both things.



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Ravi Annaswamy

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Aug 4, 2019, 10:49:05 AM8/4/19
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very nice software for 2018. Thanks

Ravi
 

இசையினியன்

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Aug 4, 2019, 10:50:04 AM8/4/19
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தேமொழி அவர்களே,

இரண்டு நிரல்கள் விடுபடுகின்றன.Tamil Year Name, Thiruvalluvar year No. போன்றவையும் இருந்தால் மட்டுமே முழுமையான தமிழ் தேதி எனத் தோன்றியது. 

தங்களின் இந்தப் பட்டியலை விரிதாளில் (Test Cases) என சேர்த்து விட்டேன். நன்றிகள் 


English DateTamil DateTamil Year NameThiruvalluvar year No.
1May 10, 185729, Chithirai
2Dec 28, 188515, Maargazhi
3Oct 16, 190531, Purattaasi
4Dec 30, 190616, Maargazhi
5Jan 9, 191526, Maargazhi
6Dec 29, 191615, Maargazhi
7Mar 18, 191905, Pangun
8April 13, 191931, Panguni
9Jun 28, 191914, Aani
10Sep 28, 192013, Purattaasi
11Mar 12, 193029, Maasi
12October 15, 193129, Purattaasi
13August 15, 194731, Aadi
14October 27, 194711, Aippasi
15January 30, 194817, Thai
16January 26, 195013, Thai
17May 18, 197404, Vaikaasi
18June 26, 197512, Aani
19October 31, 198415, Aippasi
20May 21, 199107, Vaikaasi
21December 6, 199221, Karthikai
22March 12, 199329, Maasi
23July 27, 201511, Aadi
24Aug 15, 201631, Aadi
25July 22, 201906, Aadi



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On Aug 2, 2019, at 2:37 PM, தேமொழி <jsthe...@gmail.com> wrote:

இணையத்தில் பஞ்சாங்கம்/Month Panchang  என்று தேடிப்பாருங்கள் இசையினியன், கிடைக்கும் 

பெரும்பாலும் ஜோதிடத்திற்காக உருவாக்கப்படும் மென்பொருள்கள் மூலமும்  கிரிகாரியன் தேதிக்குத் தமிழ் மாதம் தேதி பெறலாம்.

எடுத்துக்காட்டாக, https://www.drikpanchang.com/panchang/month-panchang.html  << இங்கு திருக்கணித பஞ்சாங்கம் கிடைக்கிறது, இதை நான் வரலாற்று நோக்கில் தமிழ்த் திங்கள், நாள் என அறியப் பயன் படுத்தியுள்ளேன்.  இங்கு 1600 ஆண்டு முதல் தகவல் பெறலாம்.

மேலும் தேவையானால், ஜகந்நாத ஹோரா என்ற மென்பொருளைத் தரவிறக்கியும் பயன் பெறலாம். http://www.vedicastrologer.org/jh/ << அதில் இன்னமும் பத்தாயிரம் ஆண்டுகளுக்கும் மேலாக (12899 BC-16900 AD)   பின்னோக்கியும் முன்னோக்கியும் செல்ல வாய்ப்புள்ளதாகத் தெரிகிறது. இதையும் நான் பயன்படுத்தியுள்ளேன். 







On Friday, August 2, 2019 at 8:02:06 AM UTC-7, இசையினியன் wrote:
"Tamil date month and year"?

If I give an English date How do we find the Tamil date and month and year?

Is any research was done based on this scenario?

Any information related to this is highly  appreciated.

Thanks in advance.

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இசையினியன்

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Aug 4, 2019, 10:54:03 AM8/4/19
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கந்தன் ஐயா,

/// English date என்றால் என்ன, Tamil date என்றால் என்ன? 


இந்த விரிதாளில் பார்க்கவும். "Test cases" என்ற தாளை பார்த்தால் புரியும் என எண்ணுகிறேன்.

இசையினியன்

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Aug 4, 2019, 10:57:01 AM8/4/19
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சேதுராமன் ஐயா,

இக்கருத்தை "TODO" என்பதில் சேர்த்து விட்டேன்  https://docs.google.com/spreadsheets/d/1dpVwd7wg_EOewXOLZUX56y7k3y_QW9s8kTjFrBzAYFI/edit?usp=sharing

நன்றிகள்.

Ravi Annaswamy

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Aug 4, 2019, 11:13:12 AM8/4/19
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சுக்லபட்சம் என்ற வடசொல்லை அப்படியே வெண்பக்கம் என்று மொழி பெயர்ப்பதற்கு பதில்
உண்மைப் பொருளான வளர்பிறை என்ற பயன்பாட்டுச் சொல்லை பயன்படுத்தலே நலம்.
nkantan அதையே குறிக்கிறார்.

--
Thanks for creating the shared sheet.
Please dont spend further time on table typing etc, let me spend a few hours today and write code or do excel formula.

Ravi

nkantan r

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Aug 4, 2019, 11:48:23 AM8/4/19
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Do same Tamil months have equal days every year? Really?
rnk

Ravi Annaswamy

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Aug 4, 2019, 11:55:02 AM8/4/19
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No, they do not, that is the issue.

My understanding is that Solar months start when Sun enters new Rasi, but they are delayed to next day, if the entrance is after sunset.

That is, When new month begins after sunset on a day, it is moved to next day and extra day is added to current month. 

I did not see this explicit rule anywhere since I dont have access to books where this is described. But I am going from data.

Right now I am getting more dates from the panchangam page to figure out the calculation correctly.

Please let us know if you are aware of the correct logic, since you bring up this question, sir (you are aware of the discrepancy)

Ravi

Ravi Annaswamy

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Aug 4, 2019, 1:33:33 PM8/4/19
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Iniyan

I have created Table C - for dates from 1851-2099

This is available as a new sheet called "Tamil New Year Dates 1851-2099" in your shared sheet.

Basically this table has the English date that corresponds to the Tamil New Year dates (Chittirai 1)
and which weekday it falls on.

This was created programmatically crawling from the panchangam site.

I will use program to use this table along with Table A and B to translate.
Later we can find a way to generate this table from astronomical calculation.

===

program written:
import requests, re
from datetime import datetime, timedelta

    +'alt="Tithi Icon"></div><div><h2>(.*?), (.*?)</h2><div>(.*?), (.*?)</div><div>(.*?) '+ \
    'Shaka, Kaliyugam (.*?)</div></div></div><div>New Delhi, India</div></div>'+ \
    '<div class="dpPHeaderRightContent"><h2>(.*?)</h2><strong>(.*?) (.*?)</strong>'+ \
    '<br><span>(.*?)</span></div>'

def get_tamil_date(year, month, date):
    e_date = f'{date}/{month}/{year}'
    #print(e_date)
    resp=requests.get(base_url+e_date)
    html = resp.text
    data = re.findall(pattern, html)[0]
    tamil_date, tamil_month, pirai, thithi, shaka, kali, eng_date, eng_mon, eng_year, day = data
    return kali, tamil_month, tamil_date, pirai, thithi, shaka, day


d1=datetime.strptime('11/4/1850', '%d/%m/%Y')
#date=d1.strftime('%d/%m/%Y')
for i in range(150):
    try:
        d1 = d1 + timedelta(days=365)
        kali, tmon, tday, pirai, thithi, shaka,day = get_tamil_date(d1.year, d1.month, d1.day)
        while tmon != 'Chithirai':
            d1 += timedelta(days=1)
            kali, tmon, tday, pirai, thithi, shaka,day = get_tamil_date(d1.year, d1.month, d1.day)
        print(','.join([str(d1.year), str(d1.month), str(d1.day), kali, tmon, tday, pirai, thithi, shaka, day]))

        #print(d1)
    except:
        #print(d1.strftime('%d/%m/%Y'), 'failed')
        pass

Ravi

Ravi Annaswamy

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Aug 4, 2019, 1:34:53 PM8/4/19
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EngYearEngMonthEngDateKaliTamMonthTamDatePiraiThithiShakaDayofWeek
18514124952Chithirai1Shukla PakshaEgadashi1773Saturday
18524124953Chithirai1Krishna PakshaNavami1774Monday
18534124954Chithirai1Shukla PakshaSathurthi1775Tuesday
18544124955Chithirai1Shukla PakshaSathuradasi1776Wednesday
18554124956Chithirai1Krishna PakshaThasami1777Thursday
18564124957Chithirai1Shukla PakshaAstami1778Saturday
18574124958Chithirai1Krishna PakshaThiruthiyai1779Sunday
18584124959Chithirai1Krishna PakshaThirayodasi1780Monday
18594124960Chithirai1Shukla PakshaThasami1781Tuesday
18604124961Chithirai1Krishna PakshaSapthami1782Thursday
18614124962Chithirai1Shukla PakshaThuthiyai1783Friday
18624124963Chithirai1Shukla PakshaThirayodasi1784Saturday
18634124964Chithirai1Krishna PakshaNavami1785Sunday
18644124965Chithirai1Shukla PakshaShasti1786Tuesday


This is an example.

Ravi

nkantan r

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Aug 4, 2019, 1:49:47 PM8/4/19
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Correct. The easiest and the best (if not computationally) optimized way is to use a mapping table (not algorithm or formula)

Also if the intent is to look at historical dates from British records, be cautious of years 1750-1752 when there is a jump in months and dates and shift from Julian or old style Gregorian to new Gregorian dates.

All said and done, there is no real year numbering. Shalivahana shakapta is again a brahmanical and royal usage, probably a mimic of vikram era. So where the Tamil years number? . Thiruvalluvar aandu?

rnk

Message has been deleted

nkantan r

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Aug 4, 2019, 3:20:33 PM8/4/19
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Coming to the dates issue, the almanac that we use is a mix of solar and lunar calendars. In fact, it started as a lunar calendar and evolved into a sidereal calendar.
As in astrology, the original elliptic was divided into 12 parts. Just as in astrology, the parts were initially unequal and with visible monitoring (possible in night and marked by moon's movement) the 12 months were based on full moon days. That naming still follows.

Hindu astronomical calendars overcame the difference between a year of 12 lunar months and apparent shift of equinox /seasons by adhik masa ( thirteenth month or black days).

Slowly with ability to calculate and record, it was found that apparent speed of sun and moon varies over the annum span. ( caused by the elliptical path with sun in one focus out of two focii). Then the elliptic was formakised in 12 equal parts of 30 degrees. With apparent variation of sun's traversing speed, each maasa was found to be a fractional number of days. Typical values are: +0.9, +1.4, +1.6, +1.5, +1.0, +0.5, -0.1 -0.5, -0.6, -0.5, -0.2, +0.3, (accurate to one decimal place). This adds up +5.3 giving a total of 365.3 days ( in two digits it is 365.28) matching with our current understanding of the length of a year. Thus leap year is automatically included!.

Now a day starts with sunrise and daytime (suntime) ends with sunset. Though each day is 60 naazhigai, the day and night time are different. ( I have forgotten a Tamil solvazhakku giving the reduced night and day time. Google doesnot show. Using that, one can say the extra day time and night time in months!)

If the start of the next span (entering a rasi as per calculation) is in night then that fraction is lost in this year and added to current month and normally gained within a cycle of next seven years. Thus tamil months (from above fractions) are rounded fractions losing and gaining days.

rnk

nkantan r

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Aug 4, 2019, 3:30:17 PM8/4/19
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I need not have typed such a laborious explanation. I find now it is detailed in https://ta.m.wikipedia.org/wiki/தமிழ்_மாதங்கள்

rnk

Ravi Annaswamy

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Aug 4, 2019, 3:34:34 PM8/4/19
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Very illuminating
Thank you so much sir

Sent from my iPhone
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Ravi Annaswamy

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Aug 4, 2019, 3:35:54 PM8/4/19
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Iniyan

I will add thiruvalluvar and Tamil Andu names to the spreadsheet

Ravi

Sent from my iPhone

> On Aug 4, 2019, at 3:20 PM, nkantan r <rnka...@gmail.com> wrote:
>

Ravi Annaswamy

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Aug 4, 2019, 3:45:11 PM8/4/19
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The Tamil wiki is truly impressive even though the monthwose corrections are average (cannot be used as is, we need astronomical entrance and sunset at location in order to determine isnit not?


I had looked at the English wiki for Tamil months and that was not useful

Ravi

Sent from my iPhone

> On Aug 4, 2019, at 3:30 PM, nkantan r <rnka...@gmail.com> wrote:
>
> I need not have typed such a laborious explanation. I find now it is detailed in https://ta.m.wikipedia.org/wiki/தமிழ்_மாதங்கள்
>
> rnk
>
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தேமொழி

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Aug 4, 2019, 8:23:54 PM8/4/19
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On Sunday, August 4, 2019 at 7:50:04 AM UTC-7, இசையினியன் wrote:
தேமொழி அவர்களே,

இரண்டு நிரல்கள் விடுபடுகின்றன.Tamil Year Name, Thiruvalluvar year No. போன்றவையும் இருந்தால் மட்டுமே முழுமையான தமிழ் தேதி எனத் தோன்றியது. 

 
மேலும் சில தரவுகளை அதே தளத்திலிருந்து (source: https://www.drikpanchang.com/tamil/tamil-month-panchangam.html) எடுத்து இணைத்தேன் இசையினியன். 
பகிரப்பட்ட விரிதாளில் எனக்கு மாறுதல் செய்ய  அனுமதியில்லை, ***நீங்களே இணைத்துவிடுங்கள் 

கொடுக்கப்படும் கிரிகாரியன் ஆண்டில் + 31 சேர்த்தால்  அது திருவள்ளுவராண்டு என்று கணக்கிட்டு அந்த ஆண்டுகளையும் இணைத்தேன்.
பஞ்சாங்கம் கணிப்போர் திருவள்ளுவரை ஏற்பதாக நான் அறியேன்.  அந்த தளத்திலும் திருவள்ளுவராண்டு  இல்லை.  

மேலும் இணைப்பில் உள்ள எக்ஸ்செல் ஷீட்டில் - ஷீட்1  இல் இது உள்ளது.

சரியான சோதனை April 13, 1919  என்பது போன்ற ஒரு நாளாக இருக்கும்.  
அன்று ஏப்ரல் 13 அன்றே புத்தாண்டு துவங்கிவிடுகிறது 
இது போல பொங்கல் வரும் நாளும் மாறுவதுண்டு.  அது திருவள்ளுவராண்டு துவக்கத்தை மாற்றும்.

நான் 60 வியாழ வட்டம்  கொண்டும், 
+31  என்ற திருவள்ளுவராண்டு கணக்கிலும் 
ஒரு லுக்கப் டேபில் தயாரித்துக் கொண்டு சோதனை நாட்களுக்கு நானே ஆண்டு குறிக்க முயன்றேன் 
(பார்க்க இணைப்பில் உள்ள எக்ஸ்செல் ஷீட்டில் ஷீட்2-லுக்கப் டேபில்)
ஜனவரி 14, திருவள்ளுவராண்டு துவக்கம்
ஏப்ரல் 14, சித்திரை இந்து ஆண்டு துவக்கம் என வைத்து எழுதிக்கொண்டேன். 

பிறகு தளத்தின் தரவுகளுடன் ஒப்பிட்டுப் பார்த்தேன்.

 April 13, 1919  அன்றே புத்தாண்டு துவங்கியதால் அது ஒன்று மட்டும்  மாறுபட்டது. 
ஆகவே, இது போல  பொங்கல் நாள் Janavary 14 இல் இருந்து  மாறும்பொழுதும் திருவள்ளுவராண்டு துவக்கத்தையும் மாற்றிவிடும். 



Test #English DateTamil DateThiruvalluvar year No.SakaHindu YearMonthDayMoon PhaseThithi
1May 10, 185729, Chithirai
18881779PingalaVaishakhaSundayKrishnaPirathamai
2Dec 28, 188515, Maargazhi
19161807PaarthivaMargashirshaMondayKrishnaAstami
3October 16, 190531, Purattaasi19361827VishvavasuAshwinaMondayKrishnaThiruthiyai
4December 30, 190616, Maargazhi19371828ParaabhavaPaushaSundayShuklaPournami
5January 9, 191526, Maargazhi19451836AanandaPaushaSaturdayKrishnaAstami
6December 29, 191615, Maargazhi19471838NalaPaushaFridayShuklaPanjami
7March 18, 191905, Pangun19501840KaalayukthiPhalgunaTuesdayKrishnaThuthiyai
8April 13, 191931, Panguni
19501841SiddharthiChaitraSundayShuklaThirayodasi
9June 28, 191914, Aani19501841SiddharthiAshadhaSaturdayShuklaPirathamai
10September 28, 192013, Purattaasi19511842RoudraBhadrapadaTuesdayShuklaPournami
11March 12, 193029, Maasi19611851ShuklaPhalgunaWednesdayShuklaDuvadasi
12October 15, 193129, Purattaasi
19621853PrajothpatthiAshwinaThursdayShuklaPanjami
13August 15, 194731, Aadi
19781869SarvajithShravanaFridayKrishnaSathuradasi
14October 27, 194711, Aippasi
19781869SarvajithAshwinaMondayShuklaThirayodasi
15January 30, 194817, Thai
19791869SarvajithPaushaFridayKrishnaPanjami
16January 26, 195013, Thai
19811871VirodhiMaghaThursdayShuklaAstami
17May 18, 197404, Vaikaasi
20051896AanandaVaishakhaSaturdayKrishnaEgadashi
18June 26, 197512, Aani
20061897RaakshasaJyeshthaThursdayKrishnaThiruthiyai
19October 31, 198415, Aippasi
20151906RakthakshiKartikaWednesdayShuklaAstami
20May 21, 199107, Vaikaasi
20221913PrajothpatthiVaishakhaTuesdayShuklaAstami
21December 6, 199221, Karthikai
20231914AangeerasaMargashirshaSundayShuklaEgadashi
22March 12, 199329, Maasi
20241914AangeerasaPhalgunaFridayKrishnaPanjami
23July 27, 201511, Aadi
20461937ManmathaAshadhaMondayShuklaEgadashi
24August 15, 201631, Aadi20471938DurmukhiShravanaMondayShuklaDuvadasi
25July 22, 201906, Aadi
20501941VikaariAshadhaMondayKrishnaPanjami

_________________________________________
isaiyiniyan-ravi-project.xlsx

தேமொழி

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Aug 4, 2019, 8:25:22 PM8/4/19
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தேமொழி

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Aug 4, 2019, 8:28:51 PM8/4/19
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பதிவு குளறுபடியாகவே வருகிறது!!!
நீங்கள் இணைத்த  ஸ்ப்ரட் ஷீட்டில்  இருந்தே எடுத்துக் கொள்ளுங்கள். 
<td style="border-right-color: rgb(0, 0, 0); border-bottom-color: rgb(0, 0, 0); overflow: hidden; padding: 2px 3px; vertical-align: bottom

Ravi Annaswamy

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Aug 5, 2019, 12:53:23 AM8/5/19
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Thank you for the hard work, and meticulousness, Themozhi.

I collected New Year dates from 1801-2099 from the panchang site into a spreadsheet tab.

Upon further reading of the Indian Calendric System book's excellent intro (which needs to translated into a Tamil article),
Indian Calendric System (1998 publication)
Govt of India book on calendars, I finally understood the astronomical basis for the 
New Year beginning and how to set the date to next date on sunset.

The book has full description of solar and lunisolar years and exact data for 20 year period, that gave me
the clues. Basically, in 1972, new year was born on 13apr72 at 1300 hours and hence tamil new year is same day (before sunset)
In 1973, you add 6 hours and 8 minutes, (because 365.25 days, the 0.25 days adds up 6 hours)
so new year was born on 13 Apr 73 at 19:08.
since this is after sunset, Tamil New Year is set on 14 Apr 73.
For 1974, you add 6 hours and 15 minutes new year was born on 14 Apr 74 at 1-23 early morning, so
that same day is Tamil New Year.

Why 6 hours 8 minutes one time, but 6 hours 15 min the other time? That is due to slight variations in earth's orbit around the sun.
These are modeled using VSOP87 approximation in astronomy.

I have begun to implement the sun entry (Mesha Sankranti) calculation using VSOP87 model and might take me
a few days, but this will give us accurate and simple calculation for not just Chittirai but every month. Please bear with me patiently for a few days,
I will finish and then step by step explain the logic.

Thanks
Ravi


nkantan r

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Aug 5, 2019, 1:12:59 AM8/5/19
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Be cautious about +31. As there is 14 days difference normally between jan1 and TVA-1 +31 is not a blanket. Will change to +30.

Secondly note that, in Gregorian leap years are cyclic. Not in south Indian almanac.

Given a date, also establish how many days back from today, as an additional info.

rnk

?

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Aug 5, 2019, 9:36:25 AM8/5/19
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The model is created at the site

And the javascript code is availabela at,

And the html file model also given at the page. Now we need to thing how to make english date corresponding tamil date should display at the plugin in default manner

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Ravi Annaswamy

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Aug 5, 2019, 10:38:06 AM8/5/19
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Thanks
1.  I have added a sheet with Tamil Year names and mapping to Thiruvalluvar and English years
2. I have mapping logic from Shaka to Tamil year (add 11 and take modulo 60)


On Monday, August 5, 2019 at 9:36:25 AM UTC-4, இசையினியன் wrote:
The model is created at the site

And the javascript code is availabela at,

And the html file model also given at the page. Now we need to thing how to make english date corresponding tamil date should display at the plugin in default manner

On Mon, 5 Aug 2019 at 10:43, nkantan r <rnka...@gmail.com> wrote:
Be cautious about +31. As there is 14 days difference normally between jan1 and TVA-1 +31 is not a blanket. Will change to +30.

Secondly note that, in Gregorian leap years are cyclic. Not in south Indian almanac.

Given a date, also establish how many days back from today, as an  additional info.

rnk


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?

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Aug 5, 2019, 11:19:29 AM8/5/19
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Superp ravi.

For english to tamil we should use the mapping logic only?




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Ravi Annaswamy

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Aug 5, 2019, 11:40:55 AM8/5/19
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Yes I will implement that in the spreadsheet today evening.

Ravi Annaswamy

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Aug 5, 2019, 11:46:29 AM8/5/19
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Actually I just implemented from Shaka to Tamil on this sheet
TamilNewYear_1801_2099
Please see formula on Column S
This year is Vikari.

Will add English to Tamil later.

Ravi Annaswamy

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Aug 5, 2019, 11:50:58 AM8/5/19
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Have added English Year to Tamil Year Name now in columns T and U

formula
=mod(EngYear+53,60)+1

is the year number in 60 year cycle.

For example
2019 April 14
->
2019+53 modulo 60 = 33
33rd is Vikari

Ravi Annaswamy

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Aug 5, 2019, 11:56:01 AM8/5/19
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இசையினியன்

தேமொழி அவர்கள், தாங்கள் கேட்டிருந்த நிரல்களை தயாரித்துள்ளனர்

If you have time can you please update those details from her attached sheet onto your master?
Alternatively you can share her as an editor and request her to update there.

நன்றி
ரவி

Ravi Annaswamy

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Aug 5, 2019, 11:58:52 AM8/5/19
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This formula is true only during Tamil year
eg from mid April 2019 to mid april 2020

for Jan-MidApr2019 you should reduce one number.

I will compile all rules into a code.
Ravi

?

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Aug 5, 2019, 12:28:46 PM8/5/19
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அவர்களே (test cases) விரிதாளில் பதிந்து விட்டார்கள். 

நன்றிகள்.

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?

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Aug 5, 2019, 12:47:41 PM8/5/19
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Ravi,

Can you please pull out table for "1999 Translations from web panchangam" for the years 2011 to 2021 - this is current window. 

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Ravi Annaswamy

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Aug 5, 2019, 1:45:44 PM8/5/19
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Will do.

Also I am happy to share that I have figured out the astronomical way to figure out whether New Year will fall on 13th or 14th april etc
and at what time, before or after sunset.

Based on that I am able to match the numbers from Indian-calendrics book

13 4 1972 : 11-00 hrs
13 4 1973 : 17-00 hrs
New Year is moved to 14 4 1973
14 4 1974 : 23-00 hrs
14 4 1975 : 6-00 hrs
13 4 1976 : 12-00 hrs
13 4 1977 : 18-00 hrs
New Year is moved to 14 4 1977
14 4 1978 : 1-00 hrs
14 4 1979 : 7-00 hrs
13 4 1980 : 13-00 hrs
13 4 1981 : 19-00 hrs
New Year is moved to 14 4 1981
14 4 1982 : 2-00 hrs
14 4 1983 : 8-00 hrs
13 4 1984 : 14-00 hrs
14 4 1985 : 21-00 hrs
14 4 1986 : 3-00 hrs
14 4 1987 : 9-00 hrs
13 4 1988 : 15-00 hrs
14 4 1989 : 22-00 hrs
14 4 1990 : 4-00 hrs
14 4 1991 : 10-00 hrs
13 4 1992 : 17-00 hrs
New Year is moved to 14 4 1992
14 4 1993 : 23-00 hrs
14 4 1994 : 5-00 hrs
14 4 1995 : 12-00 hrs

Details I will write up.

Will test further.

Thanks
Ravi


On Monday, August 5, 2019 at 12:47:41 PM UTC-4, இசையினியன் wrote:
Ravi,

Can you please pull out table for "1999 Translations from web panchangam" for the years 2011 to 2021 - this is current window. 

Ravi Annaswamy

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Aug 5, 2019, 6:18:19 PM8/5/19
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Happy to share that I am able to figure out beginning of every Tamil month (and hence number of days in that month for that year)
accurately using no lookup tables, but pure astronomical calculations.

This is tricky because Tamil months do not have same number of days for each month across year and there is no generic leap adjustmnet.
So I had to write a 'Look at the sun by today's evening, will it have transited to new Rasi?' to determine New Month beginning.
As a result, you cannot have a one to one conversion function between english date and tamil date, Instead you need to genrate the month's 
calendar upto that date.

What I have learnt in 3 days is a lot. Thanks for the request and the guidance from all.

I will finish the program in a day or two and provide detailed writeup (in Tamil and Python :)

I might be also able to create a spreadsheet only worked out example.

?

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Aug 5, 2019, 9:07:15 PM8/5/19
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nice Ravi,

but I don't know what is the hours mentioned in the given table below.

I expect the info also in your details which will be written.

thanks lot Ravi.

you are doing great job.
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?

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Aug 5, 2019, 9:13:31 PM8/5/19
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kalai Rajan aiyya,

do you have any clue for the question Ravi asked,

/// Look at the sun by today's evening, will it have transited to new Rasi?'

===

jayabharathan aiyya,

 what is actual meaning for the term "rasi" in astronomical? or else rasi is a fake term actually exists in the universe?

if have something please share us.

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Ravi Annaswamy

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Aug 5, 2019, 9:17:41 PM8/5/19
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Rasi is just human division of the ecliptic path into 30 degree chunks for reference 

Constellations along the ecliptic were noticed and given names

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தேமொழி

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Aug 5, 2019, 9:41:04 PM8/5/19
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Earth's motion around the Sun

இசையினியன்

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Aug 5, 2019, 11:08:39 PM8/5/19
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i give some photos, please tell the மாதம் ௧, மாதம் ௨, மாதம் ௩. I give the real mountain view the sun transverse. taken from https://thanithamizhakarathikalanjiyam.github.io/ttak_tamil_naatkaatti


தமிழ் மாதங்கள் தோராயக் கணக்கு (Year 2018 basis)

29, 30, 31, 32

 


NoTamil monthin EnglishStart dateDays
10தைThaiJanuary30
11மாசிMaasiFebruary30
12பங்குனிPanguniMarch30
1சித்திரைChiththiraiApril31
2வைகாசிVaikasiMay31
3ஆனிAaniJune32
4ஆடிAadiJuly31
5ஆவணிAavaniAugust31
6புரட்டாசிPurattasiSeptember31
7ஐப்பசிAippasiOctober31
8கார்த்திகைKarthikaiNovember29
9மார்கழிMarkazhiDecember29

Thai 1 Pongal Festival  and Tamil New Year’s Day




On Tuesday, 6 August 2019 06:47:41 UTC+5:30, Ravi Annaswamy wrote:
Rasi is just human division of the ecliptic path into 30 degree chunks for reference 

Constellations along the ecliptic were noticed and given names

Sent from my iPhone

On Aug 5, 2019, at 9:13 PM, ? <pitchaim...@gmail.com> wrote:

kalai Rajan aiyya,

do you have any clue for the question Ravi asked,

/// Look at the sun by today's evening, will it have transited to new Rasi?'

===

jayabharathan aiyya,

 what is actual meaning for the term "rasi" in astronomical? or else rasi is a fake term actually exists in the universe?

if have something please share us.


On Tuesday, 6 August 2019, Ravi Annaswamy <ravi.a...@gmail.com> wrote:
Happy to share that I am able to figure out beginning of every Tamil month (and hence number of days in that month for that year)
accurately using no lookup tables, but pure astronomical calculations.

This is tricky because Tamil months do not have same number of days for each month across year and there is no generic leap adjustmnet.
So I had to write a 'Look at the sun by today's evening, will it have transited to new Rasi?' to determine New Month beginning.
As a result, you cannot have a one to one conversion function between english date and tamil date, Instead you need to genrate the month's 
calendar upto that date.

What I have learnt in 3 days is a lot. Thanks for the request and the guidance from all.

I will finish the program in a day or two and provide detailed writeup (in Tamil and Python :)

I might be also able to create a spreadsheet only worked out example.

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இசையினியன்

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Aug 5, 2019, 11:36:26 PM8/5/19
to மின்தமிழ்
thanks themozhi,

I sent the real mountain view transverse of the sun rise view over a year. there four singificance are there.

the sun transverse from north to south, and the south to north and the center.



|================|================||
N=======>======>C=======>======>S
M1==============M3==============M2
N<======<=======C<======<=======S
M!===============M4=============M3

N is North
S is South
M1 = Aadi
M2 = Thai
M3 = Aipasi
M4 = Siththirai 

Are Tamil month names are correct or not?

see another picture also based on Tamil astrology.




Both pictures are related. 


On Tuesday, 6 August 2019 07:11:04 UTC+5:30, தேமொழி wrote:

Earth's motion around the Sun





On Monday, August 5, 2019 at 6:13:31 PM UTC-7, இசையினியன் wrote:
kalai Rajan aiyya,

do you have any clue for the question Ravi asked,

/// Look at the sun by today's evening, will it have transited to new Rasi?'

===

jayabharathan aiyya,

 what is actual meaning for the term "rasi" in astronomical? or else rasi is a fake term actually exists in the universe?

if have something please share us.


On Tuesday, 6 August 2019, Ravi Annaswamy <ravi.a...@gmail.com> wrote:
Happy to share that I am able to figure out beginning of every Tamil month (and hence number of days in that month for that year)
accurately using no lookup tables, but pure astronomical calculations.

This is tricky because Tamil months do not have same number of days for each month across year and there is no generic leap adjustmnet.
So I had to write a 'Look at the sun by today's evening, will it have transited to new Rasi?' to determine New Month beginning.
As a result, you cannot have a one to one conversion function between english date and tamil date, Instead you need to genrate the month's 
calendar upto that date.

What I have learnt in 3 days is a lot. Thanks for the request and the guidance from all.

I will finish the program in a day or two and provide detailed writeup (in Tamil and Python :)

I might be also able to create a spreadsheet only worked out example.

--
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தேமொழி

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Aug 6, 2019, 12:05:36 AM8/6/19
to மின்தமிழ்
On Monday, August 5, 2019 at 8:36:26 PM UTC-7, இசையினியன் wrote:
thanks themozhi,

I sent the real mountain view transverse of the sun rise view over a year. there four singificance are there.

the sun transverse from north to south, and the south to north and the center.



|================|================||
N=======>======>C=======>======>S
M1==============M3==============M2
N<======<=======C<======<=======S
M!===============M4=============M3

N is North
S is South
M1 = Aadi
M2 = Thai
M3 = Aipasi
M4 = Siththirai 

Are Tamil month names are correct or not?

see another picture also based on Tamil astrology.

Tamil astrology  !!!!

நாள் கணக்கிடலுக்கும் சோதிடத்திற்கும் தொடர்பில்லை.

சோதிடம்  ஒரு பிற்கால உருவாக்கம். 

வானியல் கவனிப்பு  சோதிடத்திற்காக உருவாக்கப்பட்டதல்ல.

Astoronomy முன்னரே தோன்றியது. அது அறிவியல் அடிப்படையிலானது. 

வானில் உள்ள விண்மீன்கள் மாற்றத்திற்கும்  தன்னை சுற்றி நடக்கும் இயற்கை மாற்றங்களும் ஒரு சுழற்சியில் அமைவதைக் கண்டு ஒரு முழு சுற்று ஒரு ஆண்டு என்ற கணக்கிடல் துவங்கியது.

அது எதிர்கால திட்டமிடலுக்கு உதவியிருக்கிறது.  எப்பொழுது மழைக் காலம், பனிக்காலம் என்பது போல. 

சோதிடம் என்பது அறிவியல் அடிப்படையற்றது.  

நாம் சோதிட மென்பொருளிலிருந்து  நமக்குத் தேவையான காலக் கணக்கிடலுக்கு உதவும் வானவியல் தரவுகளை எடுத்துக் கொள்கிறோம்.  அவ்வளவே.  

Ravi Annaswamy

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Aug 6, 2019, 12:11:14 AM8/6/19
to மின்தமிழ்

Iniyan

I have added 2011-2021 daily pull from panchangam page to the spreadsheet

2011-2021 Daily Eng2Tamil Date_webpull

1. You can simply use this sheet as a look up table.

2. We can also use this as a final verification.

It took long because, since this needed to pull 3500+ dates, I did not want to load the drikpanchangam site, so gave good gap
between one request to another request, as a responsible crawler.


Thanks
Ravi

தேமொழி

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Aug 6, 2019, 12:27:27 AM8/6/19
to மின்தமிழ்

source: https://www.forbes.com/sites/startswithabang/2019/01/01/this-is-how-the-sun-moves-in-the-sky-throughout-the-year/#3d13dcd37303


This Is How The Sun Moves In The Sky Throughout The Year

[...]


You can tell, from examining César Cantú's 52 combined images from throughout the year stitched together, that he photographed the Sun in the late afternoon from his latitude in Mexico.

Over the course of a 365-day year, the Sun appears to move not only up-and-down in the sky, as determined by our axial tilt, but ahead-and-behind, as determined by our elliptical orbit around the Sun. When both effects are combined, the pinched figure-8 that results is known as an analemma. The Sun images shown here are a selected 52 photographs from César Cantú's observations in Mexico over the course of a calendar year.

Over the course of a 365-day year, the Sun appears to move not only up-and-down in the sky, as determined by our axial tilt, but ahead-and-behind, as determined by our elliptical orbit around the Sun. When both effects are combined, the pinched figure-8 that results is known as an analemma. The Sun images shown here are a selected 52 photographs from César Cantú's observations in Mexico over the course of a calendar year.

 CÉSAR CANTÚ / ASTROCOLORS

It's easy to see that the topmost point corresponds to the summer solstice, while the lowest point corresponds to the winter solstice, but there is no special astronomical significance to the "crossing-point" in the Sun's analemma as seen from Earth. Occurring approximately on April 14th and August 30th, those dates are only determined by the way our seasons, determined by axial tilt, align with our planet's orbit around the Sun.

[...]

nkantan r

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Aug 6, 2019, 12:51:55 AM8/6/19
to மின்தமிழ்
Nice to bring the notion of analemma. This is shape of apparent movement. More to consider is the 'apparent' speed of traverse. This is indicated by the 4 months and 8 months difference in 'crossing point'

Aside:
analemma will have different 8 shape, at different latitudes for the same local time.
Tilt and location of analemma shall vary, at the same latitude, when captured at different fixed times.
Given that there is approximately 23000 year cycle of precession, the analemma will make a complete cycle (cart-wheel), if mapped every day at same time over 23000 years!.

?

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Aug 6, 2019, 4:17:00 AM8/6/19
to Mintamil
Test #English DateJDTamil DateTVAJDDiff
1May 10, 18572399444.529, Chithirai18882410665.526402
2Dec 28, 18852447523.515, Maargazhi19162421121.526402
3October 16, 19052417134.531, Purattaasi19362428349.5-11215
4December 30, 19062417574.516, Maargazhi19372428792.5-11218
5January 9, 19152420506.526, Maargazhi19452431724.5-11218
6December 29, 19162421226.515, Maargazhi19472432443.5-11217
7March 18, 19192422035.505, Pangun19502433620.5-11585
8April 13, 19192422061.531, Panguni19502433646.5-11585
9June 28, 19192422137.514, Aani19502433354.5-11217
10September 28, 19202422595.513, Purattaasi19512433810.5-11215

there something wrong in putting the TVAndu? because the Diff is not same... something went wrong...

Consider

this year 2019 what is the TVandu = 2019 + 31 = 2040 Right.

But when the year come in take action, which day? 
  1. Thai 1 or 
  2. Chithirai 1?
Bad politics makes this dilemma... what to do!




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?

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Aug 6, 2019, 4:22:21 AM8/6/19
to Mintamil
Ravi i came across some statment... you said 

/// Tamil calendar is Solar calendar.

But Tamil Calendar uses solar calendar system for calculating number days per year and at the same time calculating number of days in a month using sun moving from one Tamil Raasi to the other, making Tamil months to have 29 to 32 days length. In contrast, Telugu (Hindu) uses only lunar calendar.

Is tamil calendar is Solar calendar only?


On Sat, 3 Aug 2019 at 10:18, Ravi Annaswamy <ravi.an...@gmail.com> wrote:
Iniyan Sir


Great question.

Tamil calendar is Solar calendar.
(Malayalam too), since the month starts when Sun shifts to a new Rasi.

Telugu calendar is Luni-solar.

Found this great resource "South Indian Chronological Tables" published 1889 by Krishnaswamy Naidu.

It has 4 Tables and worked example for finding Tamil Year, Month and day for English date March 30, 1804 -> Rudrothkari Panguni 20

I am trying to first use the tables, but also there should be easier way to code the tables themselves computationally.


Ravi


On Friday, August 2, 2019 at 11:21:42 PM UTC-4, இசையினியன் wrote:
Ravi,

Also try to find this question. Tamil calendar is a 
  1. Solar calendar?
  2. Lunar calender?
  3. LuniSolar Calendar?
I hope this is starting point for Tamil calendar formula. But i don't know how to start.

Is ther any database available to public from ISRO or any Indian institution; like the moon rotation position, full moon, dark moon .


On Sat, 3 Aug 2019 at 08:32, Ravi Annaswamy <ravi.a...@gmail.com> wrote:
Will study this tonight and share my finding or formula 

Sent from my iPhone

On Aug 2, 2019, at 10:54 PM, இசையினியன் <pitchaim...@gmail.com> wrote:

Right.

Let tell a mathematics formula to get a Tamil date for an English date? We will deal other matters after this. Do you have Have any clue for the formula?


On Saturday, 3 August 2019 08:19:16 UTC+5:30, தேமொழி wrote:
அந்தக் குழப்பத்தில் இறங்கினீர்கள் என்றால் நீங்கள் காணாமல் போவீர்கள்.

தமிழில் எந்த மாதம் என்ன நாள் என்பதையே யாரும் தமிழில் நடைமுறையில் பயன் கொள்வதில்லை.

இன்று தமிழில் என்ன மாதம் என்ன நாள் என்று தேடாமல் எத்தனை பேர் சொல்வார்கள்?

மாதம் பெயரும் நாளும் மாறாது எனக் கொள்வோம் (வழக்கமாக தமிழகத்தில்  கணக்கிடும் முறையின்படி)

ஆண்டின் துவக்கத்தை எந்த மாதத்தில் வைத்தாலும் மாதமும் நாளும் மாறாது. 

சக, விக்கிரம, கலி, கொல்லம் என   எல்லாவற்றையும் கைவிட்டுவிடுதலே நலம். 




On Friday, August 2, 2019 at 7:40:52 PM UTC-7, இசையினியன் wrote:
This thread is for tamil calendar caluculation. Tamil calendar uses two era
  1. one is chithrai based
  2. another one is Thiruvalluvar based
Shalivahana era is not part of Tamil Calendar calculation? 

On Saturday, 3 August 2019 07:57:18 UTC+5:30, தேமொழி wrote:


On Friday, August 2, 2019 at 7:21:37 PM UTC-7, இசையினியன் wrote:
in the given example why Shaka come?

அது அரசு அங்கீகரித்த தேசிய நாட்கணக்கிடும் முறையின் கீழ் இடம்பெறுகிறது


Indian national calendar
From Wikipedia, the free encyclopedia


Mohar of Gorkha king Prithvi Narayan Shah dated Saka era 1685 (AD 1763).

The Indian national calendar, sometimes called the Shalivahana Shaka calendar. It is used, alongside the Gregorian calendar, by The Gazette of India, in news broadcasts by All India Radio and in calendars and communications issued by the Government of India.[1] The Saka calendar is also used in Java and Bali among Indonesian Hindus. Nyepi, the "Day of Silence", is a celebration of the Saka new year in Bali. Nepal's Nepal Sambat evolved from the Saka calendar. Prior to colonization, the Philippines used to apply the Saka calendar as well as suggested by the Laguna Copperplate Inscription.

The term may also ambiguously refer to the Hindu calendar; the Shalivahana era is also commonly used by other calendars.



 

Shaka year is totally different from Tamil Calculation.

Shaka and Tamil calendar are not same. My statement is Right.? or wong?

On Saturday, 3 August 2019 05:10:47 UTC+5:30, தேமொழி wrote:


On Friday, August 2, 2019 at 2:19:13 PM UTC-7, Ravi Annaswamy wrote:
If someone can give me 10 different dates spread across 1900 to 2019 in English as well as corresponding Tamil year month day I can create open source code and use this data to make sure requirements are correct

///  10 different dates spread across 1900 to 2019 in English as well as corresponding Tamil year month day  ///

But...!!!!
is that sufficient enough???
I've gleaned data for 25 dates.

Some Memorable Dates of - 
Indian Independence movement (1857-1947) ...  and India after Independence
1.
May 10, 1857 - Indian Rebellion of 1857
[29, Chithirai
Krishna Paksha, Pirathamai
1779 Shaka, Kaliyugam 4958]

2.
Dec 28, 1885 - The formation of the Indian National Congress
[15, Maargazhi
Krishna Paksha, Astami
1807 Shaka, Kaliyugam 4986]

3.
Oct 16, 1905 - Partition of Bengal
[31, Purattaasi
Krishna Paksha, Thiruthiyai
1827 Shaka, Kaliyugam 5006]

4.
Dec 30, 1906 - The formation of Muslim League
[16, Maargazhi
Shukla Paksha, Pournami
1828 Shaka, Kaliyugam 5007]

5.
Jan 9, 1915 - The Advent of Mahatma Gandhi
[26, Maargazhi
Krishna Paksha, Astami
1836 Shaka, Kaliyugam 5015

6.
Dec 29, 1916 - Lucknow Pact
[15, Maargazhi
Shukla Paksha, Panjami
1838 Shaka, Kaliyugam 5017]

7.
Mar 18, 1919 - Rowlatt Satyagraha
[05, Panguni
Krishna Paksha, Thuthiyai
1840 Shaka, Kaliyugam 5019]

8.
April 13, 1919 - Jallianwala Bagh massacre
[31, Panguni
Shukla Paksha, Thirayodasi
1841 Shaka, Kaliyugam 5020]

9.
Jun 28, 1919 - The Khilafat movement
[14, Aani
Shukla Paksha, Pirathamai
1841 Shaka, Kaliyugam 5020]

10.
Sep 28, 1920 - Non-Cooperation Movement
[13, Purattaasi
Shukla Paksha, Pournami
1842 Shaka, Kaliyugam 5021]

11.
Mar 12, 1930 - Civil Disobedience
[29, Maasi
Shukla Paksha, Duvadasi
1851 Shaka, Kaliyugam 5030]

12.
October 15, 1931 - Birth of A. P. J. Abdul Kalam
[29, Purattaasi
Shukla Paksha, Panjami
1853 Shaka, Kaliyugam 5032]

13.
August 15, 1947 - India  independence 
[31, Aadi
Krishna Paksha, Sathuradasi
1869 Shaka, Kaliyugam 5048]

14.
October 27, 1947 - India and Pakistan go to war
[11, Aippasi
Shukla Paksha, Thirayodasi
1869 Shaka, Kaliyugam 5048]

15.
January 30, 1948 - Mahatma Gandhi- assassinated
[17, Thai
Krishna Paksha, Panjami
1869 Shaka, Kaliyugam 5048]

16. 
January 26, 1950 - India becomes a republic
[13, Thai
Shukla Paksha, Astami
1871 Shaka, Kaliyugam 5050]

17.
May 18, 1974 - India conducts underground nuclear test
[04, Vaikaasi
Krishna Paksha, Egadashi
1896 Shaka, Kaliyugam 5075]

18.
June 26, 1975 - Indira Gandhi declares a state of emergency
[12, Aani
Krishna Paksha, Thiruthiyai
1897 Shaka, Kaliyugam 5076]

19.
October 31, 1984 - Indira Gandhi is assassinated
[15, Aippasi
Shukla Paksha, Astami
1906 Shaka, Kaliyugam 5085]

20.
May 21, 1991 - Rajiv Gandhi is assassinated
[07, Vaikaasi
Shukla Paksha, Astami
1913 Shaka, Kaliyugam 5092]

21.
December 6, 1992 - Hindu zealots tear down a mosque  Ayodhya
[21, Karthikai
Shukla Paksha, Egadashi
1914 Shaka, Kaliyugam 5093]

22.
March 12, 1993 - A series of bomb blasts-Bombay
[29, Maasi
Krishna Paksha, Panjami
1914 Shaka, Kaliyugam 5093]

23.
July 27, 2015 - Death of A. P. J. Abdul Kalam
[11, Aadi
Shukla Paksha, Egadashi
1937 Shaka, Kaliyugam 5116]

24.
Aug 15, 2016 -70th Independence day of India
[31, Aadi
Shukla Paksha, Duvadasi
1938 Shaka, Kaliyugam 5117]

25.
July 22, 2019 -  Chandrayaan-2 launch
[06, Aadi
Krishna Paksha, Panjami
1941 Shaka, Kaliyugam 5120]





 

Sent from my iPhone

On Aug 2, 2019, at 2:37 PM, தேமொழி <jsthe...@gmail.com> wrote:

இணையத்தில் பஞ்சாங்கம்/Month Panchang  என்று தேடிப்பாருங்கள் இசையினியன், கிடைக்கும் 

பெரும்பாலும் ஜோதிடத்திற்காக உருவாக்கப்படும் மென்பொருள்கள் மூலமும்  கிரிகாரியன் தேதிக்குத் தமிழ் மாதம் தேதி பெறலாம்.

எடுத்துக்காட்டாக, https://www.drikpanchang.com/panchang/month-panchang.html  << இங்கு திருக்கணித பஞ்சாங்கம் கிடைக்கிறது, இதை நான் வரலாற்று நோக்கில் தமிழ்த் திங்கள், நாள் என அறியப் பயன் படுத்தியுள்ளேன்.  இங்கு 1600 ஆண்டு முதல் தகவல் பெறலாம்.

மேலும் தேவையானால், ஜகந்நாத ஹோரா என்ற மென்பொருளைத் தரவிறக்கியும் பயன் பெறலாம். http://www.vedicastrologer.org/jh/ << அதில் இன்னமும் பத்தாயிரம் ஆண்டுகளுக்கும் மேலாக (12899 BC-16900 AD)   பின்னோக்கியும் முன்னோக்கியும் செல்ல வாய்ப்புள்ளதாகத் தெரிகிறது. இதையும் நான் பயன்படுத்தியுள்ளேன். 







On Friday, August 2, 2019 at 8:02:06 AM UTC-7, இசையினியன் wrote:
"Tamil date month and year"?

If I give an English date How do we find the Tamil date and month and year?

Is any research was done based on this scenario?

Any information related to this is highly  appreciated.

Thanks in advance.

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தேமொழி

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Aug 6, 2019, 4:22:42 AM8/6/19
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இல்லை !!!

2019+31 =  2050   வரும் 


But when the year come in take action, which day? 
  1. Thai 1 or 
  2. Chithirai 1?

திருவள்ளுவரைப் பின்தொடர்ந்தால்   .... வேறு வழியில்லை.  

தை 1 தான் ஆண்டின் துவக்கம்.

மாற்றிக் கொள்ள விரும்பினால் பெரிய காரியமல்ல ... கேரளாவில் கொல்லம் ஆண்டு இடையில் உருவானதுதான் 






 
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?

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Aug 6, 2019, 4:25:33 AM8/6/19
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Thanks Ravi,

we just use 2011-2021 this years at first.
Good great one ravi. 

Thanks.


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?

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Aug 6, 2019, 4:29:39 AM8/6/19
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Right what is the proper date of 

Jan 1 2019?

it falls on 2040 of TVA or 2039 of TVA. Is there any standard avail in TamilNadu government? or any source avail regarding this?


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தேமொழி

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Aug 6, 2019, 4:29:52 AM8/6/19
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Indian Calendrical Calculations 



some formulas and codes available on this paper 

?

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Aug 6, 2019, 4:34:56 AM8/6/19
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Tamil Calendar and Hindu calendar is same name? or different? Because lot calendars avail... in india subcontinent. like
  1. Tamil
  2. Kollam
  3. Shaka
  4. Telugu
  5. Bengal
Which is mentioned as Hindu Calendar?


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தேமொழி

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Aug 6, 2019, 4:38:57 AM8/6/19
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கிரிகாரியன் ஆண்டு எண்ணுடன் 31 கூட்டிக் கொள்ளுங்கள்.
அரசு எந்த ஒரு குழப்பும் முறையையும்  தவிர்த்துவிட்டார்கள்.

தொடக்கம் இந்த ஜனவரியின் நடுவில் இருந்து அடுத்த ஆண்டு ஜனவரி இடையில் வரை 

ஆக 2020 + 31 = 2051 திருவள்ளுவர் ஆண்டு தை முதல் நாளே துவங்கும்.

எனவே அடுத்து வரும் ஜனவரி 13 வரை 2050 தான் 

இந்த 2019 ஜனவரி 1 திருவள்ளுவர் 2049 என்று இருந்தது.
மற்றபடி தை 1 என்று துவக்கமோ அன்று புத்தாண்டும் துவக்கம். எளிது 



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