'The areas which bodies made to move in orbits describe...', 1687.

Proposition 1, Theorem 1, to find centripetal forces, from the first edition of Newton's 'Principia Mathematica' (1687): 'The areas which bodies made to move in orbits describe by radii drawn to an unmoving centre of forces lie in unmoving planes and are proportional to the times.' The discoveries of English physicist and mathematician Isaac Newton (1642-1727) were prolific and hugely influential on science and thought. His work included the three laws of motion, the theory of gravitation, the law of cooling, the binomial theorem and the calculus.