The Vedāṅga Jyotiṣa is an Indian text on Jyotisha, redacted by Lagadha
The text is foundational to the Vedanga discipline of Jyotisha. It is dated to the final centuries BCE. As the text describes rules for tracking the motions of the sun and the moon, its dating in the final centuries BCE seems implausible as the more sophisticated horoscopic astrology and advanced astronomical knowledge possessed by the Indians. In the Vedanga Jyotisha, Lagadha praises Jyotisha as the crowning subject in the ancillary Vedic studies of human enlightenment.
The Vedanga Jyotisha is available in two recensions: one of 36 verses associated with the Rigveda and another of 45 verses associated with the Yajurveda. There are 29 verses in common.