How Did Johannes Kepler Improve on Nicolaus Copernicus’s Theory of a Heliocentric Model of the Universe?
The problem for Copernicus was that even though the circle was accepted as the shape of celestial orbits, careful measurements did not support it. Copernicus was never able to solve the problem, but Kepler had some extra information to work with. In the 60 years since Copernicus’s death, astronomers had continued to study the pl
