Greece
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Aristarchus of Samos
Samos, Greece
Archival Overview
Ancient Greek astronomer and mathematician who proposed the first known heliocentric model of the universe eighteen centuries before Copernicus, placing the Sun at the center of planetary orbits.
Biographical Record
Aristarchus of Samos (c. 310–230 BCE) was a visionary thinker who dared to overturn geocentric dogma. In his surviving treatise On the Sizes and Distances of the Sun and Moon, he used geometric trigonometry during lunar eclipses and half-moons to calculate planetary distances.
Archimedes recorded in The Sand Reckoner that Aristarchus hypothesized that the fixed stars and the Sun remain unmoved, that the Earth revolves around the Sun in the circumference of a circle, and that the sphere of fixed stars is incomparably larger than traditionally believed. His heliocentric hypothesis was so radical that Cleanthes the Stoic demanded he be tried for impiety.
Key Life Milestones
Formulation of the Heliocentric Model
Proposed that the Earth and planets revolve around a stationary central Sun while rotating on their own axis.
Geometric Measurement of Solar and Lunar Distances
Deduced mathematical ratios comparing the diameters and distances of the Earth, Moon, and Sun.
Memorial Guestbook & Tributes
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Final Resting Place
Perpetual MemorialPythagoreio (Samos), Greece