A Critical Study of Brahmagupta and His Works: The Most Distinguished Indian Astronomer and Mathematician of the Sixth Century AD by Satya Prakash (1968)

The Brāhmasphuṭasiddhānta (“Correctly Established Doctrine of Brahma”, abbreviated BSS) is the main work of Brahmagupta, written c. 628. This text of mathematical astronomy contains significant mathematical content, including a good understanding of the role of zero, rules for manipulating both negative and positive numbers, a method for computing square roots, methods of solving linear and quadratic equations, and rules for summing series, Brahmagupta’s identity, and Brahmagupta’s theorem. The book was written completely in verse and does not contain any kind of mathematical notation. Nevertheless, it contained the first clear description of the quadratic formula (the solution of the quadratic equation)

His astronomy is key in arriving panchangs.

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