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Aryabhata

Data di nascita: 476
Data di morte: 550

Āryabhaṭa è stato un matematico, astronomo e astrologo indiano, vissuto tra il V e il VI secolo.

„In Indian astronomy, the prime meridian is the great circle of the Earth passing through the north and south poles, Ujjayinī and Laṅkā, where Laṅkā was assumed to be on the Earth's equator.“

—  Aryabhata

In Aryabhatiya quoted in: J J O'Connor and E F Robertson Aryabhata the Elder http://www-history.mcs.st-andrews.ac.uk/Biographies/Aryabhata_I.html, School of Mathematics and Statistics University of St Andrews, Scotland.

„In geometry his greatest achievement was an accurate value of π.“

—  Aryabhata

His rule is stated as: dn^2+(2a-d)n=2s, which implies the approximation 3.1416 which is correct to the last decimal place.
In, p. 245.
Encyclopaedia of the History of Science, Technology, and Medicine in Non-Western Cultures

„Translates to: for a triangle, the result of a perpendicular with the half-side is the area.“

—  Aryabhata

Origine: Arijit Roy “The Enigma of Creation and Destruction”, p. 27 from the Ganitapada, quoted in "The Enigma of Creation and Destruction".

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„Translates to: Add four to 100, multiply by eight, and then add 62,000. By this rule the circumference of a circle with a diameter of 20,000 can be approached. Thus according to the rule ((4 + 100) × 8 + 62000)/20000 = 62832/20000 = 3.1416, which is accurate to five significant figures.“

—  Aryabhata

The irrationality of pi was proved by Lambert in Europe in the year 1761.
Origine: Arijit Roy The Enigma of Creation and Destruction http://books.google.co.in/books?id=JFmUQqYzA7wC&pg=PA27, Author House, 28 October 2011, p. 27

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