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While most of his writings are lost, his legacy is preserved through the works of others like Archimedes.

: In his only surviving work, On the Sizes and Distances of the Sun and Moon , he used geometry to estimate celestial dimensions.

: Like Anaxagoras before him, he suspected stars were other suns located at immense distances, explaining the lack of observable stellar parallax. Calculations vs. Reality

Aristarchus of Samos | The Ancient Mind That Moved the Earth

Aristarchus of Samos (c. 310–230 BC) was a pioneering ancient Greek astronomer and mathematician who famously proposed the first known of the universe, placing the Sun at the center. Often called the "Copernicus of antiquity," his radical ideas were formulated nearly 1,800 years before the Copernican Revolution. Key Scientific Contributions

: He calculated that the Sun was much larger than the Earth, suggesting its massive size made it a more natural center for the cosmos.