Isaac Newton's Mathematical Principles of Natural Philosophy (Principia Mathematica), originally published in 1687. This is a reading of the first section (definitions and laws of motion). Newton's laws (at 36:23) and the definitions at the beginning are somewhat understandable but the rest of the passage is mostly incomprehensible. My video reviewing the Principia:    • The Most Famous Physics Textbook  

There are free PDFs online but if you want a physical copy: https://amzn.to/3foeKFe

In the latter half of the video, only the corollaries are read out and not their explanations which were often very visual and didn't make sense to listen to. There is also a small section about absolute motion from the first scholium which is missing.

Translated to English by Andrew Motte (1729) and revised by Florian Cajori (1947).

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