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Western Civilization II / Unit 5   WC2 0410 short lesson, about 20 seconds

Newton's Principia, 1687: One Law for Planets and Pebbles

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The idea

Newton's Mathematical Principles of Natural Philosophy of sixteen eighty-seven gave one universal law of gravitation for planets and the smallest objects, and all of physics in formulas. The witness: Kepler and Galileo gave the theory credibility, and the work culminated in the Principia.

In practice

Aristotle and Ptolemy became history of thought, not science.

Where people slip

The exam's chain: Kepler and Galileo, then Newton.

Your place on the trail

Every lesson rests on earlier ones and opens later ones. Tap any to jump.

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