Image: Eratosthenes' method for determining the size of the Earth
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Description: taken from the public domain source Geodesy for the Layman at http://www.ngs.noaa.gov/PUBS_LIB/Geodesy4Layman/TR80003A.HTM#ZZ4 Category:Images of Earth
Title: Eratosthenes' method for determining the size of the Earth
Credit: Eratosthenes'_method_for_determining_the_size_of_the_Earth.png
Author: Eratosthenes'_method_for_determining_the_size_of_the_Earth.png: *Eratosthenes'_method_for_determining_the_size_of_the_Earth.GIF: Original uploader was The Anome at en.wikipedia derivative work: Gregors (talk) derivative work: Gregors (talk) 13:26, 25 August 2011 (UTC)
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License: Public domain
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