Polymath Claudius Ptolemaeus (c. AD 100–160), better known as Ptolemy, was the most influential proponent of geocentrism and the author of such works as the Almagest and the Tetrábiblos. This project catalogues the Arabic and Latin versions of his astronomical and astrological works via catalogues of all surviving manuscripts, editions of Arabic and Latin works either written by Ptolemy or falsely attributed to him, and commentary literature. Research tools and studies are further components of the project.

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