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Sir Isaac Newton FRS PRS (25 December 1643 – 20 March 1726/27) was an English physicist, mathematician and astronomer. He is well known for his work on the laws of motion, optics, gravity, and calculus. In 1687, Newton published a book called the Philosophiæ Naturalis Principia Mathematica in which he presents his theory of universal gravitation and three laws of motion.[5] Newton built the first practical reflecting telescope in 1668. He also developed a theory of light based on the observation that a prism decomposes white light into the colors of the rainbow. Newton also shares credit with Gottfried Leibniz for the development of calculus. Newton's ideas on light, motion, and gravity dominated physics for the next three centuries, until modified by Albert Einstein's theory of relativity. After being knighted in 1705 because he was Master of the Royal Mint, he was "Sir" Isaac Newton.