Retrograde Meaning Astronomy Quiz

Retrograde Meaning Astronomy Quiz. Retrograde motion is the apparent backward motion of a planet viewed from earth. Study with quizlet and memorize flashcards containing terms like retrograde motion, who came up with the geocentric model?, who came up with heliocentric model and more.

Study with quizlet and memorize flashcards containing terms like retrograde motion, who came up with the geocentric model?, who came up with heliocentric model and more. When an inferior planet, such as venus, passes earth, differences in the planets’ orbits make the planet appear to stop and then move backward, or retrograde, in the sky for a brief time.