Excerpts from Books and Wikipedia
"Newton established three laws of motion that govern the movement of bodies on Earth and in space. His theory of universal gravity explained both the fall of an apple and motion--and wobbles--of the planets." [1001 Days] "Isaac Newton's theory of gravitation 'completes' the Copernican revolution, establishing the preeminence of science in the Western world." [Lyons: House of Wisdom, p. xiv] Philosophiæ Naturalis Principia Mathematica (Latin for Mathematical Principles of Natural Philosophy), often referred to as simply the Principia /prɪnˈsɪpiə/, is a work in three books by Isaac Newton, in Latin, first published 5 July 1687. . . . The Principia states Newton's laws of motion, forming the foundation of classical mechanics; Newton's law of universal gravitation; and a derivation of Kepler's laws of planetary motion (which Kepler first obtained empirically)." [Wikipedia]