A great mathematician and an Indian Astronomer, Brahmagupta lived and worked in a town called Billamala, situated near the northern border of Gujarat. Brahmagupta was the foremost Indian mathematician of his time. He made advances in astronomy and most importantly in number systems including algorithms for square roots and the solution of quadratic equations. Brahmagupta became the head of the astronomical observatory at Ujjain which was the foremost mathematical centre of ancient India at this time. Outstanding mathematicians such as Varahamihira had worked there and built up a strong school of mathematical astronomy.

Brahmagupta wrote important works on mathematics and astronomy. In particular he wrote Brahmasphutasiddhanta (The Opening of the Universe), in 628. The work was written in 25 chapters and Brahmagupta tells us in the text that he wrote it at Bhillamala which today is the city of Bhinmal. This was the capital of the lands ruled by the Gurjara dynasty. In addition to the Brahmasphutasiddhanta Brahmagupta wrote a second work on mathematics and astronomy which the Khandakhadyaka is written in 665 when he was 67 years old.