ANCIENT ASTRONOMY

Pythagorus:

Introducing scientific modeling to astronomy.

Aristotle:

Proofs of Earth's sphericity.

Aristarchus:

Application of Euclid's geometry to astronomy.

Erastosthenes:

Measuring the circumference of the Earth.

Hipparchus:

Measuring the Earth's precession.

Ptolemy:

Culmination of the geocentric model for motions of celestial objects.