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140 BCE
Ptolemy proposes the Geocentric Model/Theory
Under the geocentric model, the Sun, Moon, stars, and planets all orbited Earth. The geocentric model served as the predominant description of the cosmos in many ancient civilizations, such as those of Aristotle and Ptolemy. Two observations supported the idea that Earth was the center of the Universe. -
May 24, 1543
Nicolaus Copernicus publishes On The Revolutions of Heavenly Spheres
De revolutionibus orbium coelestium (On the revolutions of the heavenly spheres), written by Polish astronomer Nicolaus Copernicus (1473–1543) and published just before his death, placed the sun at the center of the universe and argued that the Earth moved across the heavens as one of the plane.
