Copernicus+Built+From?

Before Copernicus, astronomy was based on what Aristotle had discovered. Aristotle believed that there were seven planets, including the sun, that revolved around the earth. He believed that the earth was the true center of the orbiting planets and that their motion was unchanging. Copernicus challenged this theory by stating that the sun is the center of the universe. He also stated that the earth is the center of gravity. It is also the center of the moons orbit.