The geocentric theory, which posited that the Earth was the center of the universe, dominated Western astronomical thought for over a millennium, beginning with ancient Greek philosophers like Aristotle and Ptolemy. It remained the prevailing model until the late 16th century, when the heliocentric theory proposed by Copernicus began to gain acceptance. The shift to the heliocentric model was solidified by the work of Galileo and Kepler, leading to the decline of the geocentric view. Ultimately, the geocentric theory lasted for about 1,500 years before being largely replaced by modern astronomy.
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