Date of Lagadha, Vedanga Jyotisha

In this post, written in Dec 2010, I illustrate the use of precession of the winter solstice to calculate the date of lagada RSi.
Why again? Those who read the recent Astro posts, will understand why I have accepted now that the middle of mUla is the nakSatram that coincides with the winter solstice today. At that time, I had taken it as given.

Ancient Indians - Satya Samhita

What is Jyotisha?

It is the “science of lights” ie astronomy.

What is Vedanga?

Vedangas are branches of the Vedas, that one must know in order to understand them. They are Siksha, Niruktha, Kalpa, Vyakarana, Chandas and Jyotisha. (More : Vedangas, Learning Vedic Sanskrit (Nirukta Vedanga), Siksha Vedanga, Vedic Rites (Rituals) : kalpa)

How big is the Vedanga Jyotisha?

The Rg Vedic version is 36 verses long. The Yajurvedic version is 44 verses long.

Who was Lagadha?

Lagadha is the Rishi who enunciated Vedanga Jyotisha.

When did he live?

Vedanga Jyotisha tells us that at Lagadha’s time the winter solstice was at the beginning of Sravishta and summer solsitice was in the middle of Aslesha.

Today the winter solstice is in the 2nd pada of mula nakshatra.

(Dhanus Sankramanam, or the start of Dhanur Masam on 17th Dec 2010, is when the sun entered mula nakshatram. The…

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