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Edit made on February 24, 2009 by DerekCouzens at 07:05:19

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Abu Rayhan Muhammad ibn Ahmad al-Biruni al-Khwarizmi (973-1048AD).
Regarded by some as one of the greatest Islamic scholars.

Devised a method of measuring the size of the Earth from a single location,
rather than having to measure celestial angles from two (or more) different
locations simultaneously.