A landmarking publication by Dr. S.S. Lishk who is widely known for his publications in reputed journals both in India and abroad. This work is an unique contribution which deals with mathematical analysis of ancient Indian astronomy. It covers the post Vedanga and pre-Siddhantic period the so called Dark Period and hither to remaining as a forgotten chapter in history of ancient Indian mathematics and astronomy. This work initiates the task of bridging a big gap ...