Retrograde Motion
6:26
YouTubeUNL Astronomy
Retrograde Motion
This video surveys observations, historical theories, use of a mechanical demonstration, and compares the apparent motion for all superior planets of the motion.
306.2K viewsMay 16, 2015
Apparent retrograde motion Retrograde Motion Explained
* Mercury’s retrograde motion * This video explains Mercury’s apparent retrograde motion in our skies: the inner planet appears to retrace its steps a few times per year. Every planet does this, every year. Retrograde motion is an optical illusion caused by differences in the planets’ orbital speeds. When a planet seems to reverse its direction in the sky, it’s called retrograde motion (from the Latin word retrogradus – "going backward"). Courtesy: Star Walk Based on video by James O'Donoghue /
1:00
* Mercury’s retrograde motion * This video explains Mercury’s apparent retrograde motion in our skies: the inner planet appears to retrace its steps a few times per year. Every planet does this, every year. Retrograde motion is an optical illusion caused by differences in the planets’ orbital speeds. When a planet seems to reverse its direction in the sky, it’s called retrograde motion (from the Latin word retrogradus – "going backward"). Courtesy: Star Walk Based on video by James O'Donoghue /
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File:An animation to explain the (apparent) retrograde motion of Mars, using actual 2020 planet positions.webm - Wikimedia Commons
File:An animation to explain the (apparent) retrograde motion of Mars, using actual 2020 planet positions.webm - Wikimedia Commons
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