The geocentric model, also known as the Ptolemaic system, held for over a thousand years. It was standardized by the Greek astronomer Ptolemy. Based on his model, the Earth was at the center of the universe and the sun and planets revolved around it. It was the accepted model up until the 1500's when Copernicus put forth is heliocentric model, one that placed the sun at the center and the planets in orbit or it.
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