Related watching: more with Brian Cox, more orbiting, more illusions, and more tricks of perception, including The Moon Illusion. Retrograde Motion UNL Astronomy 4.98K subscribers Subscribe 2.8K 230K views 7 years ago Solar System Objects This video surveys observations, historical theories, use of a mechanical. When we pass Jupiter, for example, the gas giant appears to reverse course in the sky for a couple of months. But about every two years there are a couple of months when Mars appears to move from east to west when observed at the same time (retrograde motion). The same thing happens as Earth passes the slower moving outer planets. As you continue pulling away, the car resumes its forward motion. So Mars overtakes Jupiter, Saturn, Uranus and Neptune. Retrograde rotation: This is a rotational motion which is backwards relative to the orbital motion that an object has. It is always an interior planet that overtakes an exterior one. These occur as one planet overtakes another. Right as you pull along side and pass it, however, the car appears to move backwards for just a moment. Retrograde occurs when an inner planet laps and passes and outer planet. 1 Answer Sorted by: 2 All the planets will have retrograde periods. As you approach the slower car, it is clearly moving in the same direction you are. Though it baffled ancient astronomers, we know now that retrograde planets are an illusion caused by the motion of Earth… You can test this the next time you pass a car on the highway. What is retrograde motion and why does a planet like Mars appear to change directions in the night sky? Is it playfully looping about in its orbit around the sun or is something less strange going on? From episode 2 of Wonders of the Solar System, Professor Brian Cox explains why Mars Loops The Loop. Retrograde motion is an optical illusion caused by differences in the planets orbital speed.
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