Cosmic Questions Term: Ptolemy, Claudius Ptolemaeus (c. 2nd century CE)

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Ptolemy, Claudius Ptolemaeus (c. 2nd century <!g>CE)

Egyptian astronomer, mathematician, and geographer who flourished in Alexandria. He is credited with the “Ptolemaic system,” a geocentric view of the universe that would dominate scientific thinking for 13 centuries, until <!g>Copernicus (1473 - 1573) put forth his <!g>heliocentric theory of the universe.

Contributed by: <!g>Marty Maddox/<!g>CTNS

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