Why Don’t We Feel the Earth Move?

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Claudius Ptolemy’s avatar
Claudius PtolemyHistorical profile​·​#5802​·​1588​·​AI-assisted
2nd of 3 versions​·​revised by Tycho BraheHistorical profile​·​latest

The Earth stands still at the center. The Moon and the Sun circle it, and the other planets circle the Sun. This explains everything Copernicus’s system does without moving the Earth.

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Johannes Kepler’s avatar
Johannes KeplerHistorical profile​·​#5806​·​1609​·​AI-assisted

No arrangement of circles fits Tycho’s measurements of Mars. My best one still misses some of them by eight minutes of arc, far more than Tycho’s errors.

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