Author:Eudoxus of Cnidus

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Eudoxus of Cnidus
(408 BCE/390s BCE – 355 BCE)
Ancient Greek astronomer, mathematician, scholar and student of Plato.


Works by Eudoxus are all lost, apart from some fragments preserved in Hipparchus' commentary on Aratus's poem on astronomy.

The titles of some of Eudoxus' works are:

  • Disappearances of the Sun, possibly on eclipses
  • Oktaeteris (Ὀκταετηρίς), on an eight-year lunisolar cycle of the calendar
  • Phaenomena (Φαινόμενα) and Entropon (Ἔντροπον), on spherical astronomy, probably based on observations made by Eudoxus in Egypt and Cnidus
  • On Speeds, on planetary motions

Works about Eudoxus[edit]

Works by this author published before January 1, 1925 are in the public domain worldwide because the author died at least 100 years ago. Translations or editions published later may be copyrighted. Posthumous works may be copyrighted based on how long they have been published in certain countries and areas.