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Newton's Pincipia
July 5, 2012

Isaac Newton’s Philosophiæ Naturalis Principia Mathematica, (Latin for “Mathematical Principles of Natural Philosophy”) was published 325 years ago today, on 5 July 1687. This is the book that laid out Newtonian Physics. It’s an astonishing book.  In the section on the orbit of the planets and their moons, Newton showed that gravity depends on the square of the distance between massive bodies, and that the gravity acts as though it’s…