Question

What produces the retrograde motion of Mars?

Answer 1

. Describe what produces the retrograde motion of Mars. ... Ptolemy, in assuming that all the planets orbit around Earth, proposed that Mars (and other planets) made a small backward loop in its orbit, called an epicycle.

Answer 2

Describe what produces the retrograde motion of Mars. ... Ptolemy, in assuming that all the planets orbit around Earth, proposed that Mars (and other planets) made a small backward loop in its orbit, called an epicycle.