Kepler formulated laws of planetary motion, while Copernicus merely(!) proposed that the sun was the center of the solar system rather than the earth.
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Kepler completely replaced Copernicus's theory of the orbits of the planets, which was based on circles an epicycles, with a new theory using elliptical orbits. However Kepler retained Copernicus's idea of placing the Sun at the centre.
Copernicus didn't disprove goecentrism, that was done by Johannes Kepler, who wrote his 3 Laws of Planetary Motion. These were then expanded on by Newton to justify his theory of Gravitation.
Copernicus thought that is was heliocentric theory ( that the earth revolves around the sun) and Brahe thought that it was geocentric ( that everything revolves aroung the earth )
Copernicus' theory was that Earth is not the center of the universe and we revolve around the Sun.
Copernicus discovered the heliocentric theory in 1510 and worked on it for four more years.