![]() If the clouds ever parted, the Venusians would see the sun rise in the west and set in the east. Venus, for example, rotates or spins on its axis in the opposite direction from every other planet. There are real retrograde motions in the solar system. ![]() It just appears to do so because of the relative positions of the planet and Earth and how they are moving around the Sun. It is not REAL in that the planet does not physically start moving backwards in its orbit. Retrograde motion is an APPARENT change in the movement of the planet through the sky. Normally, the planets move west-to-east through the stars at night. Why do we observe retrograde motion?Īnswer: Retrograde motion is an APPARENT change in the movement of the planet through the sky. As a result, it looks like the Moon is travelling in the opposite direction, otherwise known as apparent retrograde motion. When standing on the Earth looking up at the sky, it would appear that the Moon travels from east to west, just as the Sun and the stars do. Even though some planets have retrograde rotation, no planet has retrograde revolution. That same effect causes them to first pause, then move “backward” (or westward) relative to the background stars, before pausing and resuming their eastward motion.Īll of the planets move around the Sun in a direct (eastward) direction, but three of them (Venus, Uranus and Pluto) rotate in a retrograde (westward) direction, and are said to have a retrograde rotation. Their retrograde motion occurs because they circle the Sun much faster than Earth and sometimes overtake our planet as they swing around our star. A familiar example of retrograde motion occurs when you pass a car on the freeway, the car being passed appears to move backwards relative to you. Retrograde motion is an illusion related to to the movement of the Earth-based observer. What is retrograde motion give an example?
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