"Absolute, true, and mathematical time, of itself, and from its own nature flows equably without regard to anything external, and by another name is called duration: relative, apparent, and common time, is some sensible and external (whether accurate or unequable) measure of duration by the means of motion, which is commonly used instead of true time; such as an hour, a day, a month, a year."
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Scholium, I
https://en.wikiquote.org/wiki/Philosophi%C3%A6_Naturalis_Principia_Mathematica
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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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