The Vishnudharmottara Purana (compiled between 300-350 AD) contains six chapters on physical and human geography. The locational attributes of peoples and places, and various seasons are the topics of these chapters.[15] Varahamihira's Brihat-Samhita gave a thorough treatment of planetary movements, rainfall, clouds and the formation of water.[17] The mathematician-astronomer Aryabhata gave a precise estimate of the earth's circumference in his treatise Āryabhaṭīya.[15] Aryabhata accurately calculated the Earth's circumference as 24,835 miles, which was only 0.2% smaller than the actual value of 24,902 miles.
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