While other ancient thinkers like Aristarchus of Samos had proposed the Sun as the center, it was Copernicus who, in his book *De revolutionibus orbium coelestium* (On the Revolutions of the Heavenly Spheres), published in 1543, provided a detailed and compelling mathematical framework for a heliocentric model.
Copernicus's model:
* Placed the Sun at the center of the solar system.
* Explained the apparent retrograde motion of planets as a result of Earth's own motion around the Sun.
* Laid the foundation for future developments in astronomy and physics.
Though Copernicus's model was not perfect (it still used circular orbits instead of ellipses), it was a significant step away from the geocentric model of Ptolemy, which had been accepted for centuries. Copernicus's work opened the door for further exploration and refinement of our understanding of the solar system.
