When Copernicus first created his Sun-centered model of the universe, it did not lead to substantially better predictions of planetary positions than the Ptolemaic model. Why not?
A) Copernicus placed the planets in the wrong order going outward from the Sun.
B) Copernicus placed the Sun at the center, but did not realize that the Moon orbits the Earth.
C) Copernicus misjudged the distances between the planets.
D) Copernicus used perfect circles for the orbits of the planets.
Answer: D