Ptolemy, Claudius Ptolemaeus (c. 2nd century CE)
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.
by: Marty Maddox/CTNS
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