Early Mathematicians IX: Eudoxus of Cnidus

Eudoxus of Cnidus

  • 408-355BC
  • He studied mathematics in Tarentum
  • He studied medicine on Sicily
  • At 23 he went to Plato’s Academy in Athens to study philosophy and rhetoric.
  • Some time later he went to Egypt to study Astronomy at Helopolis
  • He established a school at Cyzicus on the sea of Marmona
  • In 365 BC he returned to Athens with his pupils and became a colleague of Plato’s at the Academy.
  • He was the leading mathematician and astronomer of his day.
  • Developed an ingenious planetary system based on concentric spheres.
    • Earth being the center most sphere out of 28
    • The outermost sphere carries the fixed stars.
    • The others account for the sun, the moon, and the 5 planets.
    • Each planet requires 4 spheres, while the sun and moon required 3 each.


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