✓ Geocentric vs Heliocentric. • Firstly, the geocentric model and the heliocentric model are two different ways of understanding the structure and organization of the solar system: - Geocentric Model: In the geocentric model, the Earth is considered to be the centre of the universe, and all the other celestial bodies, including the Sun and the planets, revolve around it. This model was first proposed by the ancient Greek philosopher Aristotle and was later expanded upon by Ptolemy in the 2nd cen

During 310 to 230 BC Aristarchus of Samos suggested a revolutionary heliocentric cosmos by placing the Sun at the center instead of Earth. His work on the Sizes and Distances of the Sun and Moon used simple geometry and half-moon observations to prove that Earth and other planets orbited the Sun. Although his calculations were off compared to modern figures his groundbreaking ideas eventually paved the way for a scientific revolution in astronomy. | History Vault