Krishisookthi was written in very ancient times by kasyapa.The famous book brihat samhita by varahamihira is basically a commentary on this book.This book was written from4 to 5 BC,but no one is certain when krishissokthi was written.

Varahamihira was an ancient Indian astronomer and mathematician who made significant contributions in the fields of mathematics and astrology. He discovered many mathematical techniques, such as algorithms for calculating square roots and cube roots, as well as methods for predicting eclipses and planetary positions. Additionally, he wrote several important texts on astronomy and astrology, including the "Pancha Siddhantika" and the "Brihat Samhita."

Varahamihira

not sure

charak