Ptolemy's system of planetary motions, as described in the Almagest, was based on
A) magnetism.
B) gravitation.
C) electrical forces.
D) no underlying physical theory.

Question

Quizplus · Accepted Answer

Ptolemy's system, described in the Almagest, was a mathematical model that explained the apparent motions of the planets without relying on any underlying physical theory such as magnetism, gravitation, or electrical forces. It was based on the geocentric model, using epicycles and deferents to account for the observed movements of celestial bodies.

Ptolemy's System of Planetary Motions, as Described in the Almagest