Q. Who wrote the book Pancha Siddhantika? Answer:
Varahamihira
Notes: Varahamihira was one of the only renowned Indian Astronomer, Mathematician and Astrologer. Varahamihira was born in 499 A.D. into a family of Brahmins settled at Kapittha, a village near Ujjain. He wrote the book Pancha Siddhantika.