Antikythera Mechanism - Richard Taylor (2020 March)

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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?