这是一张修改过的图片，这意味着它已在原版本的基础上通过软件进行了编辑，改动内容：Redraw of pixel (png) image as vector (svg)。其原始版本为：Eratosthenes' method for determining the size of the Earth.png。修改者：Gregors。

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This image is a derivative work of the following images:

• File:Eratosthenes'_method_for_determining_the_size_of_the_Earth.png licensed with PD-USGov-NOAA
  • 2011-01-14T10:07:47Z Gregors 667x929 (133526 Bytes) {{Information |Description={{en|taken from the public domain source Geodesy for the Layman at http://www.ngs.noaa.gov/PUBS_LIB/Geodesy4Layman/TR80003A.HTM#ZZ4 [[:en:Category:Images of Earth|Category:Images of Earth]]}} |Sour

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