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Harmonia Macrocosmica
Credit: Andreas Cellarius

In astronomy, heliocentrism is the belief that the Sun is at the center of the Universe and/or the Solar System. The word is derived from the Greek (Helios = "Sun" and kentron = "Center"). Historically, heliocentrism is opposed to geocentrism and currently to modern geocentrism, which places the earth at the center.