Eudoxus of Cnidus
Greek astronomer and mathematician (c.408-c.355 BC) · Turkey · Scientists · Lived 408 BC to 355 BC · aged 53
Eudoxus of Cnidus is read about 166 times a day, in 65 languages.
A typical day, 30 days to 7 October 2026
The middle day of the days counted, so one week of news cannot move it. The line under it is the last 382 days, one point a day.
Something wrong?An ancient Greek polymath whose entire body of work vanished - yet the geometry of planetary motion and the rigorous foundation of Greek mathematics both run through ideas he set down twenty-four centuries ago.
Also in Deutsch
Photos 6
Eudoxus of Cnidus homocentric spheres model
Eudoxos, Sphärenmodell
Eudoxus' Homocentric Spheres
Hippopede of Eudoxus
Ilustración diccionario enciclopédico español Calleja Rodríguez-Navas biblioteca Gustavo Sandoval López 1909 37
Ilustración diccionario enciclopédico español Calleja Rodríguez-Navas biblioteca Gustavo Sandoval López 1909 38In their orbit
About this person
Eudoxus of Cnidus lived around 390 to 340 BC, studying under Archytas and Plato in an era when mathematics, astronomy, medicine, and law hadn't yet split into separate worlds. He worked across all four. None of his original writings survived antiquity, but fragments preserved in Hipparchus's commentaries and echoes in later texts like Theodosius of Bithynia's Spherics suggest he laid groundwork that others would build on for centuries. What remains is a shadow - enough to know the shape of what was lost.
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