Tag Archives: Heliocentric Theory

A reproduction of a portion of Aristarchus's original third-century BCE calculations, showing the relative sizes of the Sun, Earth, and Moon, which supported his revolutionary idea of a heliocentric universe.
c. 280 BCE: Aristarchus and the Concept of a Heliocentric Universe

Aristarchus, a Greek astronomer, challenged ancient geocentric beliefs by proposing a heliocentric universe, a revolutionary concept that wasn't widely accepted until centuries later with the works of Copernicus and Kepler