"Philosophiæ Naturalis Principia Mathematica", often referred to as simply "the Principia", is a work in three books by Isaac Newton. First published in Latin (5 July 1687). After annotating and correcting his personal copy of the first edition Newton also published two further editions, in 1713 and 1726. "The Principia" states Newton's laws of motion, forming the foundation of classical mechanics, also Newton's law of universal gravitation, and a derivation of Kepler's laws of planetary motion (which Kepler first obtained empirically). "The Principia" is commonly regarded as one of the most important works in the history of science.