How did Kepler’s work build upon the theories of Copernicus? Kepler proved that planets move in circular orbits around the sun.
Kepler demonstrated that more planets existed in the solar system. Kepler added to the theory that planets move in orbits around the sun. Kepler showed that gravity exists and draws objects toward one another.
While Copernicus rightly observed that the planets revolve around the Sun, it was Kepler who correctly defined their orbits. ... In an attempt to prove his theory, Brahe compiled extensive astronomical records, which Kepler eventually used to prove heliocentrism and to calculate the orbital laws.
