Almagest (Book) AKA Μαθηματικὴ Σύνταξις, Syntaxis Mathematica
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.
- 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:
- Sphere of fixed stars