Apparent Retrograde Motion (Visual Explanation)
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Published 2022-01-28
Apparent Retrograde Motion (Visual Explanation)
๐ซ๐๐ฎ๐ซ ๐ ๐ ๐๐๐ ๐:
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๐๐๐๐ฏ๐ข๐'๐ฌ ๐๐จ๐จ๐ค๐ฌ
๐ ๐ช๐ฒ๐ถ๐ฟ๐ฑ ๐ ๐ฎ๐๐ต๐: ๐๐ ๐๐ต๐ฒ ๐๐ฑ๐ด๐ฒ ๐ผ๐ณ ๐๐ป๐ณ๐ถ๐ป๐ถ๐๐ ๐ฎ๐ป๐ฑ ๐๐ฒ๐๐ผ๐ป๐ฑ
(www.amazon.com/Weird-Maths-Agnijo-Banerjee-Darlingโฆ)
๐ ๐ช๐ฒ๐ถ๐ฟ๐ฑ๐ฒ๐ฟ ๐ ๐ฎ๐๐ต๐: ๐๐ ๐๐ต๐ฒ ๐๐ฑ๐ด๐ฒ ๐ผ๐ณ ๐๐ต๐ฒ ๐ฃ๐ผ๐๐๐ถ๐ฏ๐น๐ฒ
(www.amazon.com/Weirder-Maths-At-Edge-Possible/dp/1โฆ)
๐ ๐ช๐ฒ๐ถ๐ฟ๐ฑ๐ฒ๐๐ ๐ ๐ฎ๐๐ต๐: ๐๐ ๐๐ต๐ฒ ๐๐ฟ๐ผ๐ป๐๐ถ๐ฒ๐ฟ๐ ๐ผ๐ณ ๐ฅ๐ฒ๐ฎ๐๐ผ๐ป
(www.amazon.com/Weirdest-Maths-David-Darling/dp/178โฆ)
** The kindle versions are available
*** For more details : weirdmaths.com/
๐๐ง๐ฟ๐ฎ๐ป๐๐ฐ๐ฟ๐ถ๐ฝ๐๐ถ๐ผ๐ป:
If we observe the planet Mars in the sky over a period of 2 years, we see that it slows down, stops, goes back and then returns its original path.
Why does Mars move like that? In reality, Mars doesnโt actually slow down or stop or go back. The movement in the sky we see is just an illusion called apparent retrograde motion. It happens because Mars orbits the Sun at different distances and speeds than Earth does.
If we look at the solar system, planets that are closer to the Sun orbit faster. As you know, Earth orbits the Sun every 365 days. Mars, on the other hand, completes one orbit of the Sun in 687 days โ almost twice as long. That means every 2 years Earth catches and passes Mars. If we look at Mars and Earthโs orbital movements from Earthโs perspective, we can see clearly that when Earth catches and passes Mars, Marsโ path looks like a loop.
Apparent retrograde motion is valid for other planets, including the inner planets Mercury and Venus. However Mercury and Venus always pass Earth during daytime, so their apparent retrograde motions are difficult to observe.
#Apparent #Retrograde #Motion
All Comments (21)
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that's just....the best explanation of retrograde I've ever heard and seen. Thank you!
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I remember learning this years ago in school, but an animation is much easier to understand than a diagram in a book.
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I always liked how the Ptolemaic system explained the retrograde motion of the planets. It made 100% sense!
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Wonderfully made and narrated
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This is such an awesome channel!!!
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Excellent, thank you!
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Iโve been searching everywhere for this bless up
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There are so many astronomy youtubers and yet no one thought of explaining this. I learnt about this from an Indian astrologer and his presentation on pc app drawing and saw today animation explanation. Thanks.
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Great explanation
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It looks so great and mesmerizing ๐ฎ
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Great scientific explanation sans astrology, thanks
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great vid
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Thanks!
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great video
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I think a horizontal demonstration from the same plane would show better than this overhead view. It works to point out the different speeds from the overhead view but you have to transition to the horizontal plane and show why the earth orbit in relationship to mars causes the back & forth you witness from your observation on the ground.
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Tq
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So you change the planet yr looking for progressing in the same motion . eg Neptune . . Thank you for this .
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Come for the science, stay for the music.
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That's actually cool. It looks at they're doing a little dance around the sun :D
