Who theorized planets moved in oval paths around the sun?
When it was believed that the planets revolved around the Earth, the planetary paths were plotted and were erratic and did not comply with the laws of motion and gravity as we now understand them. That was overlooked by the believers in an Earth centered Solar System. When the Sun centered Solar System was theorized by Copernicus, the paths of the planets around the Sun became organized into relatively circular (or elliptical). Much simpler, and…
Who theorized that the moon the sun and the planets moved in a perfectly circular orbits around the earth?
The theory was officially written down by Plato, teacher of Aristotle, in 4th century B.C. Most ancient Greek astronomers followed the lead. The most recent well-known astronomer to hold to the theory was Tycho Brahe, in 16th century A.D. He created a revised geocentric model which explained the motion of planets pretty accurately, but the motion paths were much more complicated than the heliocentric model.