Picture of George Trebizond's Latin translation of Claudius Ptolemy's Almagest (ca. 1451)
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Original image by Joonasl. Uploaded by Cristian Violatti, published on 15 July 2013 under the following license: Creative Commons: Attribution-ShareAlike. This license lets others remix, tweak, and build upon your work even for commercial reasons, as long as they credit you and license their new creations under the identical terms.