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What was the original Greek title of the Almagest?
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Ptolemy
Ptolemy's theory of the solar system.
The original Greek title of the work now known as the Almagest was Hē mathēmatikē syntaxis, which translates to "The Mathematical Collection" or "The Mathematical Arrangement." The name Almagest itself is derived from an Arabic corruption of the Greek word megiste, meaning "the greatest."12