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In the 1500's, many different astronomical models of the Universe were created, the most famous models were the Geocentric and the Heliocentric models. A Geocentric model proposes that the Earth is the center of the universe and a Heliocentric model proposes that the sun is the center of the universe. The model was most common in ancient Greece and was proposed by the greek philosiphers Aristotle and Ptolemy. Today we believe that we live in a Heliocentric universe.The three most famous astronomers that proposed we live in a heliocentric universe are Galilieo, Copernicus, and Kepler.