Ptolemy was a Greek mathematician, astronomer, and geographer who lived in the 2nd century CE. He is best known for his work, the 'Almagest', which presented a geocentric model of the universe that influenced scientific thought for many centuries. Ptolemy's ideas about the cosmos and geography were significant in the context of Hellenization as they blended Greek knowledge with the cultural influences from the regions that Alexander the Great had conquered.
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