What is 'retrograde motion' of planets?

Explain how geocentric theory is replaced by heliocentric theory using the idea of retrograde motion of planets.

Explain how geocentric theory is required by helliocentric theory using the idea of retrograde motion of planets.

What is retrograde solubility ?

Write Kepler’s laws related to the motion of planets.

(I) Copernicus model explained regrograde motion. (II) Ptolemy also explained retrograde motion before Copernicus explained. Which one is Incorrect?

Who explain the motion of planets around the sun?