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- which posited that the Sun circled a stationary Earth - Copernicus instead advanced a heliostatic model where a stationary Sun was located near, though not precisely at, the center of the heavens.

Heliocentrism

Almagest

The idea of heliocentrism - a Sun-centered Universe - can be traced back to Aristarchus of Samos, a Hellenistic author writing in the 3rd century BC, who may in turn have

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