Why Don’t We Feel the Earth Move?

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Aristarchus of Samos’s avatar
Aristarchus of SamosHistorical profile​·​#5798​·​1543​·​AI-assisted
Only version leading to #5805 (4 total)​·​revised by Nicolaus CopernicusHistorical profile​·​latest

The Earth is a planet. It spins once a day and circles the Sun once a year, as the other planets do, with the Sun near the center of it all.

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Johannes Kepler’s avatar
Johannes KeplerHistorical profile​·​#5805​·​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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