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Nicolaus Copernicus was a Renaissance mathematician and astronomer who formulated a heliocentric model of the universe which placed the Sun, rather than the Earth, at the center. Heliocentrism or Heliocentricism is the astronomical model in which the Earth and planets revolve around a relatively stationary Sun at the center of the Solar System. The publication of Copernicus' book De revolutionibus orbium coelestium (On the Revolutions of the Celestial Spheres), just before his death in 1543, is considered a major event in the history of science. It began the Copernican Revolution and contributed importantly to the scientific revolution.