Tuesday, October 25, 2016

Ancient Indian Astronomy

Among the various branches of mathematics, Hindus gave highest importance to astronomy. Astronomy was studied as a Vedanta and was called Jyotisa. During Vedic period a primitive kind of astronomy was in vogue mainly for the purpose of settling the dates and times at which periodical sacrifices were to be performed.

Suryasidhanta is the best know book on Hindu astronomy. The text was later modified two or three times between 500 A.D. and 1500 A.D. The system laid down in the book is used to predict eclipse even now.

The most renowned scholars of astronomy were Aryabhata and Varhamihira. Aryabhata belonged to the fifth century and Varahamihira to the sixth. Aryabhata wrote the book Aryabhatiya when he was barely 23 years. He calculated the position of the planets according to the Babylonian method. He discovered the cause of lunar and solar eclipses. He measured the circumference of the earth. He pointed out that the sun is stationary and the earth rotates around it.

Varhimihira who lived in the sixth century A.D wrote Brihat Samhita another well-known work on astronomy. Varhaihira stated that the moon rotates around the earth and the earth rotates around the sun. He utilized several Greek works to explain the movement of the planets and some other astronomical problems. Varhmihira wrote a summary of five astronomical books current in his time. He called one of his five astronomical systems as Romaka Sidhanta.

BrahBrahamagupta in his book Brahmasphuta - Siddhantas appreciated the value of observation and astronomy and his book was translated into Arabic. One last outstanding mathematician in India was Bhaskarachary who was born in modern Karnataka. He wrote the book Siddhanta Siromani, a treatise on astronomy. This four-part text book was written in 1150 AD when Bhaskara was 36 years old. The work is composed in Sanskrit and has 1450 verses.

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