0085 – Ptolemy – bio

Claudius Ptolemaeus was born in Egypt around 85 as a Roman citizen. He was a mathematician, astronomer and geographer. He is famous for a series of books:

  • Harmonics – on musical theory
  • Optics – properties of light, including reflection, refraction and color
  • Geography – used a coordinate grid system
  • Tetrabiblos (four books) – on astrology
  • Planetary Hypothesis – a geocentric model that described the planets as moving in nested orbital shells
  • Syntaxis (aka Amagest) – mathematical astronomy, included a catalog of stars and constellations

PREREQUISITE:
Hipparchus
Pythagoras

SUBSEQUENT:
1473 – Copernicus
Kepler

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