Description: (Greek Astronomer and Mathematician Who Presented the First Known Heliocentric Model)
Aristarchus of Samos was an ancient Greek astronomer and mathematician known for proposing the first heliocentric model, which placed the Sun at the center of the universe. He made significant contributions to astronomy, including creating sundials and estimating the sizes and distances of celestial bodies. Aristarchus challenged the prevailing geocentric theories of his time and his work influenced later astronomers such as Copernicus. He is revered as one of antiquity's greatest astronomers alongside Hipparchus.