Philosophiæ Naturalis Principia Mathematica

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Newton's copy of the Philosophiae Naturalis Principia Mathematica
Newton's own copy of the first edition. He wrote in it. He wrote the changes he wanted to make in the second edition.

The Philosophiæ Naturalis Principia Mathematica (Mathematical Principles of Natural Philosophy) is a trilogy, written by Isaac Newton and published on 5 July 1687. The three-book work describes physics and mathematics. It states Newton's laws of motion and the derivation of Kepler's Laws, and observations on gravity.