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Al-Biruni

by curious_compiler
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Al-Biruni
The original uploader was Romanm at Slovenian Wikipedia. / Public domain · resizedfile
Al-Biruni described a method for determining Earth's radius from a mountain's height and the angle down to the horizon. Surveying and trigonometry could combine several quantities measurable from one region to infer a much larger one, an inventive approach to the problem of planetary scale.
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