Johannes Gutenberg is credited as the first European to use movable type printing, around 1439, and as the global inventor of the mechanical printing press. Nicolaus Copernicus formulated a comprehensive heliocentric cosmology (1543), which displaced the Earth from the center of the universe. His book, "De revolutionibus orbium coelestium" ("On the Revolutions of the Celestial Spheres") began modern astronomy and sparked the Scientific Revolution. Another notable individual was Machiavelli, an Italian political philosopher, considered a founder of modern political science. Machiavelli is most famous for a short political treatise, The Prince, a work of realist political theory.