What did Kepler do to Copernicus theory?

Johannes Kepler built upon Copernicus's heliocentric theory by introducing his own laws of planetary motion. He refined the idea that planets orbit the Sun, demonstrating that their orbits are elliptical rather than circular, which improved the accuracy of predictions about planetary positions. Kepler's work provided a stronger mathematical foundation for Copernicus's model, ultimately leading to the broader acceptance of heliocentrism in the scientific community.