Copernican Revolution #5

De Revolutionibus is not a perfect book, but is has facts that helped push new ideas.

Copernicus based himself on his predecessors Ptolemy and Hipparchus. and the Copernicans based themselves on Copernicus, just as he did before them.

All of these astronomers had different spectacles. Depending on which ones they had on, they saw the world differently. Ptolomaic spectacles, Copernican spectacles.

Could Kepler have done his solar system without Brahe?
I dont think so, because Brahe's data was more accurate than any other, and Kepler tried to fit in his solar system into this data. So without this data, Kepler would've had an incomplete system.