Ptolemy, Claudius Ptolemaeus (c. 2nd century 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 Copernicus  (1473 - 1573) put forth his heliocentric theory of the universe.

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Contributed by: Marty Maddox/CTNS