How did Ptolemy "fix" the geocentric system?
A) He introduced retrograde motion.
B) He introduced prograde motion.
C) He moved the Sun to the center.
D) He introduced epicycles.
E) He introduced Earth's motion.

Question

Quizplus · Accepted Answer

Ptolemy introduced epicycles, which are small circular orbits that planets follow while simultaneously orbiting Earth, to explain the observed retrograde motion of planets in the geocentric model.

How Did Ptolemy "Fix" the Geocentric System