To add to this: I think that what appears to us to be stagnation in scientific interest was due to the fact that Ptolemaios was so brilliant. Contrary to popular belief, the empirical quality of his cosmology in terms of predictability was not surpassed by Copernicus, but only by Kepler about 100 years later.

There were some minor discrepancies, that bothered experts in the late middle ages, which let to Copernicus. But even he could not convincingly solve them. (In his theory the Sun is not at the center, but the mean Sun, as is the center of Ptolemaios deferent not exactly the Earth.)

With Ptolemaios, however, cosmology had stabilised to such an extent that the fundamental questions had found their answers and astronomers turned their attention to practical issues and refinements, such as calendars and the related problem of the very odd movements of the moon. (You need Newton and gravitation to solves this, more or less.)