Re: [-BAS-] Digest for b-a-s@googlegroups.com - 12 Messages in 5 Topics
Balachandra Rao
Your question as to how there can be 2 "sankrantis" in a
lunar month is quite pertinent. Therefore it needs an explanation! On
your terms, a lunar month (approx.) = 29.530589 days and a sidereal
solar month = sidereal solar year/12 = 365.256364/12 = 30.43803 days.
Hence solar month > lunar month , QED says Sunil!
But the above values are all only "mean" (madhyama,
average). The "true" lengths of lunar months are different from the
"mean" value depending on the varying ang. velocities of the Sun &
Moon. This, in turn, depends on the angular distance ("anomaly",
manda-kendra) from the apogee (mandochcha) of either body. The same
is the case
with a solar month based on the anomaly of the earth from its apogee.
Thus, though less frequently, a " kshayamasa"
does occur when in that particular peiod a lunar month contains a full
solar month within it !
Balachandra Rao
On Thu, Jan 19, 2012 at 12:12 PM, <b-...@googlegroups.com> wrote:
> Today's Topic Summary
>
> Group: http://groups.google.com/group/b-a-s/topics
>
> First BAS Star Party in 2012 - 21st and 22nd Jan 2012 [2 Updates]
> Messier object 33 [5 Updates]
> Evening Star over Delhi's Icon [1 Update]
> reg. Adhika masa and Kshaya masa [3 Updates]
> My article: Light Pollution: Can it be reduced [1 Update]
>
> First BAS Star Party in 2012 - 21st and 22nd Jan 2012
>
> vivek <vive...@gmail.com> Jan 18 02:15AM -0800
>
> We have reached the limit on the number of people we can accommodate
> for the event and thus registrations for the event have been closed
>
> Regards
> Vivek
>
>
>
> "Rasik Mhatre" <rasi...@gmail.com> Jan 19 11:58AM +0530
>
> Vivek,
>
> Could you send us the best route by road?
>
> Regards
>
> Rasik Mhatre
> F1407 Mantri Tranquil
> Sy. No. 7/9/13 Gubbalala
> Off Kanakpura Road
> Bangalore 560 061
> TEL: +91-80-42087005/22573247
> CELL: +91-9916135779
> SKYPE ID: rasikdon
> TRANQUIL CENTREX: *826470
>
> -----Original Message-----
> From: b-...@googlegroups.com [mailto:b-...@googlegroups.com] On Behalf Of
> vivek
> Sent: Wednesday, January 18, 2012 15:45
> To: Bangalore Astronomical Society
> Subject: [-BAS-] Re: First BAS Star Party in 2012 - 21st and 22nd Jan 2012
>
> We have reached the limit on the number of people we can accommodate for the
> event and thus registrations for the event have been closed
>
> Regards
> Vivek
>
> --
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>
>
> Messier object 33
>
> Suresh Mohan Neelmegh <drsure...@gmail.com> Jan 19 01:01AM +0530
>
> Friends
> last weekend i tried two objects, one was the horse head nebula and also a
> galaxy which ive never tried before.Thanks for looking. I guess thats all
> for now.
> ISO800x 15 subs x 10 min each.
> Suresh
> link is here
> *http://tinyurl.com/87zcnzu*
>
>
>
> sathya kumar prasanna <skps...@gmail.com> Jan 18 08:59PM
>
> Doc,
>
> Beautiful picture, but the bluish stars seem to exhibit a little coma? or
> am I mistaken?
>
> Sathya
>
> On Wed, Jan 18, 2012 at 7:31 PM, Suresh Mohan Neelmegh <
>
>
>
> Shekhar Phatak <shekhar...@gmail.com> Jan 19 06:07AM +0530
>
> Fantastic, Doc!!
>
> Shekhar
>
> On Thu, Jan 19, 2012 at 2:29 AM, sathya kumar prasanna
>
> --
> Warm regards,
>
> Shekhar Phatak
>
>
>
> Suresh Mohan <drsure...@gmail.com> Jan 19 06:51AM +0530
>
> No you are correct , the scope was kept untouched with camera in place and I
> did not collimate
> Suresh
>
> Sent from my iPhone
>
>
>
>
> keerthi kiran <info...@gmail.com> Jan 19 08:59AM +0530
>
> Never knew M33 had soooo many spiral arms... Awesome photo doc!
>
>
>
>
> Evening Star over Delhi's Icon
>
> Ajay Talwar <ajayta...@gmail.com> Jan 18 09:47PM +0530
>
> Hello Fellow Astronuts,
>
> Just one lone star over Delhi's heavily lighted Icon. Even that star, in
> the late evening, is not a star.
>
>
> https://picasaweb.google.com/113638702638202116204/CelestialAlignmentsInDelhi#5699005219594578818
>
> or
>
> http://goo.gl/vezzo
>
>
> Ajay Talwar
>
>
>
> reg. Adhika masa and Kshaya masa
>
> pradeep <pradeep...@gmail.com> Jan 17 11:24PM -0800
>
> Keerti, Pavan, and others..
>
> This is reg. the concept of adhika masa used in luni-solar calendars in
> India.
>
> The synodic period of moon is ~29.54 days which makes 1 lunar month. While
> the solar year is ~365.25 days. So this implies that we complete 12 lunar
> months ( 29.54 * 12 = 354.48 days) in every solar year with still few days
> remaining. i.e. 365.25 - 29.54 * 12 = 365.25 - 354.48 = 10.77 days
>
> This extra 10.77 days of every solar year accumulates to make 1 *Adhika masa
> *. It takes 29.54 / 10.77 = 2.74 solar years for this to happen. The number
> of lunar months involved in 2.74 solar years = 2.74 * 12 = 32.913 lunar
> months.. This means this phenomenon of adhika masa happens every 32 or 33
> lunar months.
>
> Since 32.913 is a fraction, this necessiates the need to remove 1 month
> from the calendar at certain times to keep the solar and lunar calendars in
> sync. As you guessed it right, this is *Kshaya masa*. How often this
> happens can be calculated by expressing this number as continued fractions
> (I suppose)
>
> This is the concept of adhika and kshaya masa as I understand from what I
> gathered in the wrokshop conducted by Dr.Balachander Rao's sir.
> Dear Sir, Please confirm if I am right in my understanding and calculations.
>
> Best regards,
> Pradeep
> --
> *Perspective Dimension* <http://paradoxsolutions.blogspot.com/>,
> *Technically
> Speaking* <http://ideasreloaded.blogspot.com/>, and *Opinion and
> Editorials*<http://opinion-editorials.blogspot.com/>
>
>
>
> Balachandra Rao <balacha...@gmail.com> Jan 18 03:41PM +0530
>
> Dear Pradeep,
> You are perfectly right! As regards the Kshayamaasa, you have
> correctly explained its necessity
> due to the fraction in 32.913. Therefore, compared to the adhikamasa,
> the kshayamasa (a lunar month to be removed from a lunar year). is
> less frequent and not completely periodic. It may occur once in 19 or
> 122 or 141 years as shown by Bhaskara II in his "Siddhaanta-shiromani"
> using successive convergents of a continued fraction. It is further
> known that a kshyamasa can occur only in one of the three lunar
> months: Kaartika, Maargashira and Pushya. The rule to determine a
> kshayamasa is that in that particular lunar month there will be 2
> solar "sankraantis" (see "Indian Astronomy - An Introduction",
> S.Balachandra Rao, Universities Press, Hyderabad, 2000, pages47-48).
> Balachandra Rao
>
>
>
>
> "Sunil G.R." <super...@gmail.com> Jan 18 04:47PM +0530
>
> Since a new thread is created for this, pasting the same from other thread.
>
> +++++++++++
>>>> [Balachandra Sir] To decide which lunar month is "adhika" (leap-month)
> the rule is simple: that lunar month (between two successive newmoons) is
> considered as adhika in which there is no (sidereal) solar ingress into the
> next "Rashi".
>
> [sunil] I could not recall for a moment on the calculation of 'Adhika
> maasa'. I vaguely remember as below.
> In simple terms, in whatever 'maasa', the Sun enters next constellation on
> Panchami (5th day of maasa), that particular 'maasa' will become 'Adhika'
> in the next year.
> Will try to validate this and confirm.
>
> I think the recent Adhikamaasa was bit early (just after 2 years).
> +++++++++++
>
> Ok. i verified for 2010's Adhika-maasa in April.
> The formula i heard in simple terms is:
> "In whatever 'maasa' the Sun enters next constellation (Sankranti) on
> Panchami (5th day of lunar month), in the next year, its NEXT lunar month
> becomes Adhika"
>
> i.e. in 2009, Sun entered next constellation on 5th day of Chaitra maasa.
> Next to Chaitra is 'Vaishaka'.
> So, in 2010, 'Adhika Vaishaka' appeared after Chaitra-maasa.
> i.e. in 2010, the order of maasa is:
> Chaitra -> Adhika-Vaishaka -> Vaishaka.
>
> In fact as Sir mentioned, in that Adhika Vaishakha, there were no Sankranti
> of Sun :).
>
> But could not understand, how come 2 Sankrantis can happen in 1 lunar month!
> As lunar month is ALWAYS lesser than Solar-month.
>
> Regards,
> Sunil.
>
> On Wed, Jan 18, 2012 at 3:41 PM, Balachandra Rao
> <balacha...@gmail.com>wrote:
>
>
>
>
> My article: Light Pollution: Can it be reduced
>
> Anand Sivaram <asp...@gmail.com> Jan 18 04:28PM +0530
>
> Neeraj, Akarsh, Harshad,
>
> Thanks for reading the article.
> It would be a good idea to have an IDA chapter for Bangalore.
> I am interested both from Astronomy and Energy point of view. I guess many
> Astronomers here
> also would be interested in that.
>
> Thanks and Regards
>
> Anand
>
>
>
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>
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Sunil G.R.
hmm.. yes, looking at the 'real' value rather than 'mean/average' value solved my doubt :)
Regards,
Sunil.