The Origins of Eudoxus' Geocentric Model of the Universe

In 432 BC, two Athenian astronomers measured these periods as 90 days. Eudoxus' model assumes the sun travels at a constant speed in a circular orbit. This would imply that these periods between the solstices and the equinoxes should be equal. Nevertheless, this doesn't seem to have troubled him. Just because to the Greeks at this time, very little effort was made to compare these mathematical and geometrical models to real data. It did set them apart from the Babylonians, who had been primarily interested in observation and prediction.