What belief did nicholas Copernicus have that revolutionized other peoples way of thinking?

Copernicus was one of the people that proposed the idea of a heliocentric model of the solar system. Prior to Copernicus most people believed in the geocentric model in which all things revolved around the Earth. He published his ideas in the book De revolutionibus orbium coelestiu (On the Revolutions of the Celestial Spheres).