- Nicole Dabene
Move the planets around their respective orbits.
It was not until the 17th century that a German astronomer by the name of Johannes Kepler was able to explain planetary motion. It was originally believed that the orbits of planet occured in spheres which were nestled in pyramids and other polyhedra. Kepler soon realized that he was unable to fit the orbit of Mars inside a sphere and thus realized that planetary orbits did not occur in circular motions.