Brihat Parasar Hora Sastra

The Bṛhat Parāśara Horāśāstra is a foundational compilation of Indian astrology, or horā.
The Bṛhat Parāśara Horāśāstra is the most comprehensive extant work on natal astrology in Hindu astrology ascribed to any Rishi or sage according to the text itself. Its oldest printed version is a composite work of 71 chapters, in which the first part (chapters 1-51) dates to the 7th and early 8th centuries, and the second part (chapters 52-71) dates to the latter part of the 8th century. A commentary by Govindaswamin (a mathematician) on the second portion, which presupposes the first, is dated to c. 850 CE and attests to the scope of the work at that date. The text says that this work was created by Sage Parashara (father of Veda Vyasa, the compiler of Mahabharata) for the benefit of the people in this Kaliyuga (the age of the Kali).