Apparent Retrograde Motion (Visual Explanation)

Short Video Series (SVS-0021)
Apparent Retrograde Motion (Visual Explanation)

📫𝐎𝐮𝐫 𝐅𝐁 𝐏𝐚𝐠𝐞:
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📚𝐃𝐚𝐯𝐢𝐝'𝐬 𝐁𝐨𝐨𝐤𝐬
📕 𝗪𝗲𝗶𝗿𝗱 𝗠𝗮𝘁𝗵𝘀: 𝗔𝘁 𝘁𝗵𝗲 𝗘𝗱𝗴𝗲 𝗼𝗳 𝗜𝗻𝗳𝗶𝗻𝗶𝘁𝘆 𝗮𝗻𝗱 𝗕𝗲𝘆𝗼𝗻𝗱
(https://www.amazon.com/Weird-Maths-Ag...)
📙 𝗪𝗲𝗶𝗿𝗱𝗲𝗿 𝗠𝗮𝘁𝗵𝘀: 𝗔𝘁 𝘁𝗵𝗲 𝗘𝗱𝗴𝗲 𝗼𝗳 𝘁𝗵𝗲 𝗣𝗼𝘀𝘀𝗶𝗯𝗹𝗲
(https://www.amazon.com/Weirder-Maths-...)
📗 𝗪𝗲𝗶𝗿𝗱𝗲𝘀𝘁 𝗠𝗮𝘁𝗵𝘀: 𝗔𝘁 𝘁𝗵𝗲 𝗙𝗿𝗼𝗻𝘁𝗶𝗲𝗿𝘀 𝗼𝗳 𝗥𝗲𝗮𝘀𝗼𝗻
(https://www.amazon.com/Weirdest-Maths...)
** The kindle versions are available
*** For more details : http://weirdmaths.com/

📄𝗧𝗿𝗮𝗻𝘀𝗰𝗿𝗶𝗽𝘁𝗶𝗼𝗻:
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 doesn’t 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 – almost twice as long. That means every 2 years Earth catches and passes Mars. If we look at Mars and Earth’s orbital movements from Earth’s perspective, we can see clearly that when Earth catches and passes Mars, Mars’ 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.

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