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[[[> IMG:Al-Biruni.jpeg ]]]
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.

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* http://www.google.com/search?q=Al-Biruni
* http://en.wikipedia.org/wiki/Al-Biruni
* http://www.antiochgate.com/about_biruni.htm
* http://www-groups.dcs.st-and.ac.uk/~history/Mathematicians/Al-Biruni.html