Another point, discussed in Arthur Koestler's The Sleepwalkers (I'm going from memory, so there may be slight errors), is that the Copernican model was pretty u

Another point, discussed in Arthur Koestler's The Sleepwalkers (I'm going from memory, so there may be slight errors), is that the Copernican model was pretty ugly: 1. It actually required more epicycles than the Ptolemaic model. 2. It didn't even have the other planets orbit the Sun! Rather, they orbited the center of the Earth's orbit (???). Kepler's laws fixed all of this, but Galileo ignored all of Kepler's correspondence, except for one time when he found it profitable to use him: He had made claims about the Jovian moons based on observations through his telescope, but he refused to let other astronomers borrow that instrument so they could reproduce his observations. Kepler wrote to Galileo offering to defend him, and Galileo accepted. Then later, after Kepler had already publicly defended him and himself requested access to the telescope to verify the observations, he was ignored, as per all other times Kepler wrote him before and after.