Bṛhat Saṃhitā is a very old book that has lots of information about astrology and astronomy, which is all about the stars and planets in the sky. It was written in India a long, long time ago by a man named Varāhamihira.
The book is really big and has lots of different chapters that talk about different things. For example, one chapter talks about how different planets affect our lives, and another chapter talks about how to tell time using the stars.
It’s like a big instruction book for understanding the sky and how it affects our lives. People who study and believe in astrology and astronomy use the information in this book to help them understand the world around them, predict the future, and make decisions.