The Ptolemaic universe theory, developed by the ancient Greek astronomer Claudius Ptolemy, posits that the Earth is at the center of the universe, with all celestial bodies, including the Sun, Moon, and stars, orbiting around it in circular paths. This geocentric model was widely accepted for over a millennium until the Copernican heliocentric model gained prominence. Ptolemy's system utilized epicycles—small circular orbits superimposed on larger ones—to explain the observed retrograde motion of planets.
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