Who proposed planet orbiting the earth in perfect circle?

The idea of planets orbiting the Earth in perfect circles is primarily associated with the ancient Greek philosopher Claudius Ptolemy. In his geocentric model, outlined in the "Almagest," Ptolemy proposed that celestial bodies, including planets, moved in circular orbits around the Earth, using epicycles to account for their observed movements. This model dominated astronomical thinking for many centuries until the heliocentric theories of Copernicus and later developments in astronomy.