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Which heliocentric theory did Archimedes describe in The Sand-Reckoner?
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Archimedes
Archimedes, oil on canvas by Giuseppe Nogari, 18th century; in the Pushkin Fine Arts Museum, Moscow. Archimedes was an ancient Greek mathematician and inventor.
In his treatise The Sand-Reckoner, Archimedes describes the heliocentric system proposed by the Greek astronomer Aristarchus of Samos.12
Archimedes notes that Aristarchus hypothesized that the Earth rotates on its axis and revolves around the Sun, which sits at the center of the universe. Archimedes further explains that this model implies the universe is significantly larger than previously believed, as the Earth's motion would otherwise cause a parallax in the positions of the fixed stars that was not observed.13