"It is indeed a matter of great difficulty to discover, and effectually to distinguish, the true motions of particular bodies from the apparent; because the parts of that immovable space, in which those motions are performed, do by no means come under the observation of our senses. Yet the thing is not altogether desperate: for we have some arguments to guide us, partly from the apparent motions, which are the differences of the true motions; partly from the forces, which are the causes and effects of the true motions."
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Scholium, IV
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Philosophiæ Naturalis Principia Mathematica
' (English: The Mathematical Principles of — often referred to as simply the Principia) is a famous book by Isaac Newton. The book established the foundations of classical mechanics and gives the physics and mathematics of and his based on . The Principia is written in Latin and comprises three volumes. The 1st edition was published in 1687 with a 2nd edition in 1713 and a 3rd edition in 1726.
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