Nikolaus Kopernikus (born February 19, 1473 in Thorn, † May 24, 1543 in Frauenburg; actually Niklas Koppernigk, Latinized Nicolaus Cop [p] ernicus, Polonized Mikołaj Kopernik) was a canon of the Duchy of Warmia in Prussia as well as an astronomer and doctor who himself also dedicated to mathematics and cartography.
In his main work De revolutionibus orbium coelestium he describes a heliocentric view of the world, according to which the earth is a planet, rotates around its own axis and also moves around the sun like the other planets. (Wikipedia)