The geocentric model is an astronomical theory that places the Earth at the center of the universe, with all other celestial bodies—such as the Sun, Moon, planets, and stars—orbiting around it. This model was widely accepted in ancient civilizations and was famously promoted by the Greek philosopher Claudius Ptolemy in the 2nd century AD in his work, the Almagest.
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A model in which the Earth is stationary at the centre of the relevant celestial system. Distinguish this broad class from a particular ancient planetary arrangement.
