The Copernican Model is a heliocentric theory proposed by Nicolaus Copernicus in the 16th century. It suggests that the Sun is at the center of the universe, and the Earth, along with other planets, orbits around it. This was a significant shift from the earlier geocentric model, which placed the Earth at the center. Copernicus' ideas laid the groundwork for modern astronomy and challenged long-held beliefs about the cosmos. His model was further supported by the observations of astronomers like Galileo Galilei and Johannes Kepler, leading to a better understanding of planetary motion and the structure of our solar system.