Heraclides Ponticus Suggests Earth's Axial Rotation

Around 350 BCE, Greek philosopher and astronomer Heraclides Ponticus proposed that Earth rotates on its axis from west to east once every 24 hours. Working in Athens, he suggested the apparent daily motion of stars resulted from Earth's rotation rather than the celestial sphere revolving around a fixed Earth. This contradicted the dominant Aristotelian model of a stationary Earth at the universe's center. While not widely accepted at the time, Heraclides' theory influenced later astronomers including Aristarchus of Samos, who developed heliocentric ideas in the following century.