Galileo Galilei confirms the heliocentric system: the knowledge that the earth revolves around the sun, as opposed to the geocentric system, with the earth in the center of the universe.
Even the severe, religious opposition and suppression of the Middle ages, which still included burning on stakes, could not withhold the ever growing evidence of this measurable reality.
The theory of the heliocentric system had already been published by Nicolaus Copernicus in his Revolutionibus Orbium Coelestium (1543), but was already theorized upon by Aristarchus of Samos (-310 - -230) in ancient Greece, and possibly by the Egyptians even centuries before him.