However, because Copernicus retained circular orbits, his system required the inclusion of epicycles. By postulating only the rotation of the Earth, Eric Weisstein's World of Astronomy revolution about the sun, Eric Weisstein's World of Astronomy and tilt of Earth's Eric Weisstein's World of Astronomy rotational axis, Copernicus could explain the observed motion of the heavens. Even though the mathematics in his description was not any simpler than Ptolemy's, it required fewer basic assumptions. The idea that the Sun Eric Weisstein's World of Astronomy was the center of the solar system was not new (similar theories had been proposed by Aristarchus and Nicholas of Cusa), but Copernicus also worked out his system in full mathematical detail. In this model, the sun Eric Weisstein's World of Astronomy was actually not exactly the center of the solar system, but was slightly offset from the center using a device invented by Ptolemy known as the equant point. Copernicus became interested in astronomy and published an early description of his "heliocentric" model of the solar system in Commentariolus (1512). Polish astronomer and mathematician who, as a student, studied canon law, mathematics, and medicine at Cracow, Bologna, Rome, Padua, and Ferrara.
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