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Isaac Newton's manuscript "On the motion of bodies in an orbit"; (De Motu) which he had sent to Edmond Halley, is read to the Royal Society. The manuscript gave important mathematical derivations relating to the three relations now known as "Kepler's laws of planetary motion".
Before Newton's work, those derivations had not been generally regarded as scientific laws. After further encouragement from Halley, Newton went on to develop and write his book "Philosophiæ Naturalis Principia Mathematica" (Principia) which includes nearly all of the manuscript content. More
