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.
Contributed by: Marty Maddox/CTNS
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