3 stories from this place.
Eudoxus of Cnidus proposed in the 360s BC that the apparent motions of the planets could be explained by a system of 27 concentric rotating spheres centred on the Earth. Aristotle expanded the model to 55 spheres. The framework substantively defined European cosmology until Tycho Brahe.
Read the story →[Eudoxus of Cnidus](/articles/eudoxus-of-cnidus) — Plato's contemporary and the founder of mathematical astronomy — proposed in the 360s BC that the apparent motions of the Sun, Moon, and five known planets could be explained by 27 concentric spheres rotating around the Earth at different rates and on different axes. The model was the best astronomical framework in the world for the next two centuries.
Read the story →Before Eudoxus, Greek mathematicians could prove statements about simple shapes. Eudoxus invented the method that let them prove statements about curves.
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