For example, modern scholars generally date Gargiya-jyotisha to the 1st century CE, although the source materials for this text are probably of much earlier origin.
Mahabharata 13.18.25–26 (Anushasana Parva) refers to the 64 divisions of a work of Garga, a description identical to the one given in the second chapter of the Gargiya-jyotisha.
[4] Surya-garbha, a chapter in Narendrayaśas' 585 CE Chinese translation of the Buddhist text Mahasamnipata, describes Garga (jialijia) as a sage who "taught the positions of nakshatras, methods of long and short months and time measurements.
[1] According to David Pingree, much of the material in the works attributed to Garga is derived from Mesopotamian omen literature,[6] but later scholars such as Bill Mak doubt this.
These texts are certainly not the work of a single author, and cover a wide range of topics including astronomy, horoscopy, planetary omens, and bird divination.