The heliocentric model.
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Copernicus was not the first to propose a sun centered Solar System. He cited the ideas of ancient Greek thinkers Philolaus and Aristarchus of Samos as an influence.
Copernicus proposed a heliocentric model with the sun at the center of the solar system, while Galileo supported this idea with observational evidence through his use of the telescope. Galileo's observations also challenged the geocentric model supported by the Catholic Church at the time.
Athletic Model Guild was created in 1945.
New Model Army was created in 1645.
American Indian Model Schools was created in 1996.