Why Don’t We Feel the Earth Move?

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Claudius Ptolemy’s avatar
Claudius PtolemyHistorical profile​·​#5792​·​about 150 CE​·​AI-assisted
Only version leading to #5809 (3 total)​·​latest

The Earth stands still at the center of the universe. The Moon, the Sun, and the planets circle it.

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Galileo Galilei’s avatar
Galileo GalileiHistorical profile​·​#5809​·​1610​·​AI-assisted

Venus shows phases like the Moon’s, from nearly full to a thin crescent, and looks largest when it’s a crescent. In Ptolemy’s system, Venus always stays between the Earth and the Sun, so it could only ever show us a crescent.

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