Vedanga Jyotisha
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The Vedanga Jyotisha, is an Indian text on Vedic astronomy, redacted by Lagadha (लगध), and which has been dated to 1350 BCE. The text describes rules for tracking the motions of the sun and the moon. In the Vedanga Jyotisha Lagadha praises astronomy as the crowning subject in the ancillary Vedic studies.
It is written in a very terse style, and it has taken the work of many scholars to translate it satisfactorily. The most authoritative translation into English was done by T.S. Kupanna Sastry and published by the Indian National Science Academy.
The Vedanga Jyotisha is available in three recensions: those of Yajurveda, Rigveda, and Atharvaveda.