Indian astronomer and mathematician.
Born: c. 598 AD
Died: c. 670 AD
In his magnum opus Brahmasphutasiddhanta, Brahmagupta was the first known mathematician to document on the arithmetic properties of zero as a number. The concept of zero as a number may have been known in India prior to Brahmagupta. Radiocarbon dating of the Bakhshali Manuscript has revealed that parts of the document was written in the 4th century AD, the 7th century AD, and the 10th century AD.
Approximation of Pi