On Speeds
work by Eudoxus of Cnidus
Learn about this topic in these articles:
discussed in biography
- In Eudoxus of Cnidus: Astronomer
…the first to attempt, in On Speeds, a geometric model of the motions of the Sun, the Moon, and the five planets known in antiquity. His model consisted of a complex system of 27 interconnected, geo-concentric spheres, one for the fixed stars, four for each planet, and three each for…
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history of astronomy
- In astronomy: The motion of the planets
In a book, On Speeds (which is lost but was briefly discussed by Aristotle and Simplicius), Eudoxus regarded each celestial body as carried on a set of concentric spheres, which nest one inside another. For each planet, three different motions must be accounted for, and Eudoxus proposed to…
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