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In Surya Siddhanta, dated 400-500 AD.

The Surya Siddhanta is an ancient astronomical text believed to have been written by an unknown author. It is considered one of the most important texts in Indian astronomy and provides valuable insights into topics such as planetary motion, eclipses, and timekeeping.

Aryabhatta,,, he wrote to books called 'Aryabhattiya' and 'Surya Siddhanta'... the name of the book in the question is typed wrong,,, write to me if u want to know more abt the books....

Surya Siddhanta is one of the ancient doctrines of Hindus and refers to Archeo-Astonomical principles and studies. It referes to measurement of time, calendar, days, months, years, eclipses, Earth, Sun, Moon and other celestial bodies and astronomical studies. The original author is not known. However, Surya Siddhanta has found frequent mentions in the works of prominent Astronomers like Varahmihir, Aryabhatta, etc.