The epicycle, in the Greek planetary model, is the
A) circle centered on Earth about which the center of the smaller circular motion moves.
B) off-center point in the planetary system occupied by Earth.
C) focus of the ellipse that is the orbit of the planet around Earth.
D) small circle through which the planet moves as the center of this circle orbits Earth.

Question

Quizplus · Accepted Answer

The epicycle is a feature of the Ptolemaic system of astronomy, where each planet moves in a small circle called an epicycle, while the center of this circle moves around Earth in a larger circle.

The Epicycle, in the Greek Planetary Model, Is the