"The tradition of celebrating Makara Samkrānti as the start of Uttarāyana is thus the result of a kind of ‘freeze’ in our traditions, as we stopped updating our festival calendars by making it shift freely along with the precession of the equinox and the slow shift of seasons.
Are there any side effects for this freeze?
Primarily, this will make our tradition at variance with science. Contrary to popular belief, our Dhārmic tradition is not anti-science and it always went along with science and with truth (Satya/Ŗta)."
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I have written and published on this topic and hence will be brief:
1. Rainfall is seasonal and depends on sun’s position. Wrong sun-nakshatras lead farmers and others to doubt, dislike and eventually shun dhārmic traditions.
2. Vaikuṇṭha ekādaśī as observed in ancient South Indian Viṣṇu temples is to open the Uttarāyaṇa-door . Due to mismatch between lunar and solar calendars this drifts but comes together on 21 December once in 18-19 years, even now. Some modern temples name the special inner sanctum door as Vaikuntha-vaasal, having forgotten the original symbolism. The 21 day stationary position of Sun is observed as the Raa-pattu and Pahal-pattu (night-10 and morning-10) festival on either side of the Vaikuṇṭha ekādaśī.
3. In the Indictoday article, RV 1.164 has been taken to indicate 3-types of motions. The first daily (E-W) and second annual (E-W among nakshatras) are straightforward. The third one (precession and its rate) is problematic since there are references in Vedic texts to the sun's lateral (N-S) motion meaning, southernmost (visible) point to northernmost (visible) point and back. Sāyaṇabhāṣya does not discuss any of the above! Perhaps for the yājñika tradition it is sufficient to take the three centers of Sun’s wheel to mean morning, mid-day and evening positions.
4. Felt effects of precession and conscious knowledge of precession are two different phenomena. The first is a certainty whereas the second is of low probability but not an impossibility. For the first, if interested, see (https://www.academia.edu/39950940/Archaeo_astronomy_and_Ancient_Indian_Chronology). For the second reference to the work of D.W.Johnson (https://westgatehouse.com/cycles.html) would be very appropriate. I am mentioning this in passing. The IT longread article is well written.

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Three questions come to mind:1. Why did this freeze happen? Why did they choose to stop calculating any further? When all lunar calendar based festivals are still being calculated every year, and have different solar calendar dates, and we are okay with that. This freeze happened way before foreign cultures ruled over Bharat, so what caused this freeze so early on?2. Even as late as the 8th century, when House Of Wisdom was being formed and astronomer Kanka was invited, Surya Siddhanta etc were in use and were understood. So why did society stop updating the festival date? DId the theorists (those who would do the calculations) and practicalist (celebrating on the streets and society) lose connection somehow?3. If the freeze happened, but everyone knew that 14 Jan is not the actual uttarayana or makara sankranti, why did they keep saying so? I mean, they could celebrate the festival whenever they want, but why keep calling it uttarayana and sankranti? Even when it is known by different names around India (Bhogi, Lohri etc), it is still said that Sun goes uttarayana? That is, do people say that Bhogi is celebrated when the sun goes uttarayana?
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.... अयनांशैर्हीनं लग्नं स्यात्।
Thereafter, at the end of the procedure, he prescribes:.... [that] diminished by the degrees of precession, would be the lagna.
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----Regards-Venkatesh