Answer:
Johannes Kepler
Explanation:
Johannes Kepler was a 17th Century Astronomer and mathematician who gave the famous laws of planetary motion. The first law states that the planets move around the star in an elliptical orbit and not a circular orbit.
He worked as an assistant with Tycho Brahe, another great astronomer of that era and used data collected by him to formulate the laws of planetary motion. Although Brahe believed in Geocentric Theory of the Universe, it was Kepler who used his data to prove the Heliocentric Theory correct.
