Original: The Philosophiæ Naturalis Principia Mathematica , which is Latin for '' mathematical principles of natural philosophy '' , often Principia or Principia Mathematica for short , is a three-volume work by Isaac Newton first published on 5 July 1687 .
Simplified: The Philosophiae Naturalis Principia Mathematica was a trilogy written by Isaac Newton and published on July 5 , 1687 .