Copernicus, Nicolaus (1473–1543)

Copernicus argued that the earth is a planet revolving around the sun, as well as rotating on its own axis. His work marked the culmination of a tradition of mathematical astronomy stretching back beyond Ptolemy, to the Greeks and Babylonians. Though it was associated with methods and assumptions that had been familiar for centuries, it was also revolutionary because of its implications for the relations between humankind and the universe at large.