Abu Raihan al-Biruni: Béda antarrépisi

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===Kartografi===
Dina umur 22 taun, anjeunna nulis sababaraha karya tulis pondok, nyaeta ngeunaan [[map projections|proyeksi peta]], ''[[Cartography|Kartografi]]'', nu kaasuo kana metoda keur proyeksi [[Sphere|hemisphere]] dina [[plane (mathematics)|plane]].
{{tarjamahkeun|Inggris}}
 
===Geodesy and Geography===
At the age of 17, Biruni calculated the [[latitude]] of Kath, [[Khwarazm]], using the maximum altitude of the Sun. Biruni also solved a complex [[Geodesy|geodesic]] equation in order to accurately compute the [[Earth]]'s [[circumference]], which were close to modern values of the Earth's circumference.<ref name=Khwarizm/><ref>James S. Aber (2003). [http://academic.emporia.edu/aberjame/histgeol/biruni/biruni.htm Abu Rayhan al-Biruni], [[Emporia State University]].</ref> His estimate of 6,339.9 km for the [[Earth radius]] was only 16.8 km less than the modern value of 6,356.7 km.