Almagest (Book) AKA Μαθηματικὴ Σύνταξις, Syntaxis Mathematica

Almagest
Almagest

Almagest
150 AD - 1175 AD
AKA Μαθηματικὴ Σύνταξις, Syntaxis Mathematica

Ptolemy presents his geocentric model of the universe, a star catalog, and astronomical calculations in a 13 book set.
Ptolemy's assumptions:

  • The celestial realm is spherical, and moves as a sphere.
  • The Earth is a sphere.
  • The Earth is at the center of the cosmos.
  • The Earth, in relation to the distance of the fixed stars, has no appreciable size and must be treated as a mathematical point.
  • The Earth does not move.

Planetary model, going from Earth at center outwards:

  • Earth
  • Moon
  • Mercury
  • Venus
  • Sun
  • Mars
  • Jupiter
  • Saturn
  • Sphere of fixed stars
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