Copernicus proposed a heliocentric model from "summary" of To Explain the World by Steven Weinberg
In the sixteenth century, Nicolaus Copernicus put forward the revolutionary idea that the Earth is not the center of the universe. According to his heliocentric model, the Sun lies at the center of the solar system, with the Earth and other planets revolving around it in circular orbits. This proposal challenged the prevailing geocentric view, which held that the Earth was stationary at the center of the cosmos, with all celestial bodies moving around it. Copernicus's heliocentric model was a significant departure from traditional beliefs about the structure of the universe. By placing the Sun at the center, he sought to explain the observed motions of the planets more simply and elegantly than the complicated system of epicycles used in the geocentric model. Instead of needing separate sets of motions for each planet, the heliocentric model posited a single system in which all planets moved around the Sun in a harmonious...
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