PhilosophiÃ¦ Naturalis Principia Mathematica (Latin for 'Mathematical Principles of Natural Philosophy') states Newton's laws of motion and of universal gravitation. It's regarded as one of the most important works in the history of science..
He held the chair of astronomy in the CollÃ¨ge de France in for nearly half a century and a number of his pupils became distinguished astronomers. As well as being an observer, Lalande also gave popular lectures and wrote about astronomy.
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