Question:Why was Copernicus better able to conceive a correct model of the Solar system than Ptolomy was able to construct?
Copernicus had more information about the motion of the planets coupled with more understanding of some basic physics.
Copernicus was aware that the brighness of the planets changed with time, which they should not if they are at a constant distance from a central Earth.
He also had more written records to study which showed him that some of the motion of the planets was impossible to explain by the Geocentric models. For example the retrograde motion of planets at different points in time.