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uncomfortable levels of eye contact
(mander.xyz)
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this post was submitted on 21 Dec 2023
655 points (98.4% liked)
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Can you ELI5 that last one?
Mercury orbits the sun every 88 earth days. It spins on its axis every 59 earth days, relative to an outside observer (sidereal day.) That makes the solar day (from sunrise to sunrise) 179 earth days long.
So in a certain sense, a 'day' on Mercury is 2.034090909090 'years' long? (Solar day divided by orbiting the sun, lol)
No. I rounded off the numbers. A Mercury day is exactly 2 Mercury years. Which is why it's "in resonance". That means that gravity will speed up or slow down the rotation to keep the ratio stable over time.
Oh that's really neat!
Guys please upvote we all need an eli5