[credit_guy]

Copernicus and Galileo, yes, but not Kepler.

Kepler didn't just state that planets move on eclipses in general. Here's his three laws [1]:

    > 1. The orbit of a planet is an ellipse with the Sun at one of the two foci.
    > 2. A line segment joining a planet and the Sun sweeps out equal areas during equal intervals of time.
    > 3. The square of a planet's orbital period is proportional to the cube of the length of the semi-major axis of its orbit.

The first two laws are extraordinarily specific heliocentric. He did not just state his laws, he backed them with numbers. With tens of thousands of observations tallied over many decades by Tycho Brahe and himself. Whoever claims Kepler did not have proof, has now idea what they are talking about.

[1] https://en.wikipedia.org/wiki/Kepler%27s_laws_of_planetary_m...