Editing Copernican principle (section)

===Historical===
Before the term Copernican principle was even coined, past assumptions, such as [[geocentrism]], [[heliocentrism]], and [[galactocentrism]], which state that Earth, the Solar System, or the Milky Way respectively were located at the center of the universe, were shown to be false. The [[Copernican Revolution]] dethroned Earth to just one of many planets orbiting the Sun. [[Proper motion]] was mentioned by Halley. [[William Herschel]] found that the Solar System is moving through space within our disk-shaped [[Milky Way]] galaxy. [[Edwin Hubble]] showed that the Milky Way galaxy is just one of many galaxies in the universe. Examination of the galaxy's position and motion in the universe led to the [[Big Bang|Big Bang theory]] and the whole of modern [[cosmology]].