Copernicus developed the heliocentric model of the solar system, proposing that the Sun, not the Earth, is at the center of the solar system. This model challenged the prevailing geocentric model (Earth-centered) that had been accepted for centuries.
Kepler, building upon Copernicus' work, formulated Kepler's Laws of Planetary Motion, which described the elliptical orbits of planets around the Sun and the relationship between their orbital periods and distances from the Sun.
Therefore, the combined work of Copernicus and Kepler, with their groundbreaking theories and observations, led to our modern understanding of planetary motion.
