Heliocentrism is an astronomical model that positions the Sun at the center of the solar system, with the Earth and other planets orbiting around it. This concept contrasts with the earlier geocentric model, which placed the Earth at the center of the universe. The heliocentric theory was first fully developed by the ancient Greek philosopher Aristarchus of Samos but was later popularized and supported by the work of Nicolaus Copernicus in the 16th century.
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