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Apastamba was a scholar and author of the Kalpa-sutras, a text on geometry.
His Kalpa-sutra is divided into thirty chapters. While the first 29 chapters deal with rituals, the thirtieth contains information on geometry. One of the most notable facts deliniated by Apastamba is an approximation of the square root of 2. It must be noted that like all the other Sulba-sutras (vedic geometrical texts), it is not known how much of the mathematical development therein is original and how much is merely a transcription of existing knowledge.
SOURCES:
Mathematics in the Making in Ancient India – G. Thibaut (Munshiram Manoharlal Publishers 1984)
http://en.wikipedia.org/wiki/Apastamba
