heliocentrism noun2 •The theory that the Sun is the center of the universe.It wasn't until the Renaissance that scientists such as Nicolaus Copernicus and Galileo Galilei showed proof for heliocentrism, or the idea that the planets moved around the sun. — 2019 •(informal) The phenomenon of the Earth revolving around the Sun.Heliocentrism is not yet universally known or accepted. In a 1999 poll, 18 of Americans said that the sun revolves around the Earth, while 79 percent said Earth revolves around the sun. — 2014
