When a planet is in retrograde What is the apparent motion? Retrograde motion is an APPARENT change in the movement of the planet through the sky. It is not REAL in that the planet does not physically start moving backwards in its orbit. It just appears to do so because of the relative positions of the planet and Earth and how they are moving around the Sun.
What is apparent retrograde motion How is it explained? A: The apparent retrograde motion of planets (and other objects) on the sky is an illusion caused by the fact that objects in our solar system orbit the Sun at different distances and speeds. This is certainly easiest to picture for superior planets — those outside of Earth’s orbit — such as Mars.
What happens during the apparent retrograde motion? Apparent retrograde motion is an illusion created by turbulence in Earth’s atmosphere. 3. As Earth passes another planet, its gravitational pull slows down the other planet so that it appears to be traveling backward.
Why is retrograde motion important? The Sun and planets formed from that disk and spin in the same direction. If a body is retrograde it must have had an encounter with another objects otherwise it would violate the law of conservation of momentum. In our solar system, Venus spins in the opposite direction to the other planets and so is retrograde.