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Ptolemy | Accomplishments, Biography, & Facts | Britannica.com
Claudius Ptolemy | Greek mathematician and astronomer | New Scientist
Ptolemy: Everything you need to know... - YouTube
Interesting events from Ptolemy's life - Ptolemy Biography
Ptolemy | Biography + Discoveries + Facts | - Science4Fun
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Cowell history of astronomy timeline | Timetoast timelines
Astronomers of the Past timeline | Timetoast timelines
Claudius Ptolemy
Ptolemy (85 - 165) - Biography - MacTutor History of Mathematics