Antikythera Mechanism - Richard Taylor (2020 March)

Overview: 

Models of the Solar System

  • Ptolemy: Geocentric, circles and epicycles
  • Copernicus: Heliocentric, circles and epicycles
  • Kepler: Heliocentric, ellipses and non-uniform speed

How did circles and epicycles simulate ellipses and non-uniform speed? How did ancient astronomers calculate planetary positions?