What was the year of birth of the mathematician that is credited with developing infinitesimal calculus and using Jean Picard's measurement of earth to create his theory of universal gravitation?
Isaac Newton Sir Isaac Newton {'1': ", '2': ", '3': ", '4': "} ( ; 25 December 1642 – 20 March 1726/27) was an English mathematician, astronomer, and physicist (described in his own day as a "natural philosopher") who is widely recognised as one of the most influential scientists of all time and a key figure in the scientific revolution. His book "Philosophiæ Naturalis Principia Mathematica" ("Mathematical Principles of Natural Philosophy"), first published in 1687, laid the foundations of classical mechanics. Newton also made pathbreaking contributions to optics, and he shares credit with Gottfried Wilhelm Leibniz for developing the infinitesimal calculus.
Paolo Pizzetti Paolo Pizzetti (July 24, 1860 – April 14, 1918) was an Italian geodesist, astronomer, geophysicist and mathematician. He studied engineering in Rome, graduating in 1880. He remained in Rome and assisted Giuseppe Pisati and Enrico Pucci with their absolute determination of gravity. In 1886, he became Associate Professor of Geodesy at the University of Genoa where he stayed until becoming Professor of Geodesy at the University of Pisa in 1900. He stayed in Pisa until his death in 1918.