In cosmology, heliocentrism, as compared to geocentrism, is the model, aka “heliocentric model”, according to which the earth goes around sun, which is at the center of the solar system; the model was first speculated on by Philolaus (c.399BC).

References
1. Bailey, Cyril. (1928). The Greek Atomists and Epicurus: a Study (ΡΊ)(pdf). Russell & Russell, 1964.

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