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  #1  
Old 2014-02-12, 02:40
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A Sun That Never Sets

Remember that time I made a video of a hypothetical orbit cycle that would give Twinsun sunsets but never night?

Well, here's the real thing:
http://www.youtube.com/watch?v=ndlQNicOeso
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Old 2014-02-12, 13:13
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In an infinite universe, everything is real somewhere

Actually, in all seriousness, there's 50 billion stars in our galaxy alone - most binary.
I think their could well be a planet out there a bit like Twinsun at least in terms of orbits.
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Old 2014-02-13, 09:04
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Twinsun doesn't have this type of orbit, the vid wwas filmed on earth...
I still don't get how this kind of thing is possible on Twinsun, the sun goes up and down here because as the earth rotates, the angle with the sun changes... But on Twinsun the suns are on the south/north axis, no angle change when Twinsun rotates, the sun shouldn't even move...
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Old 2014-02-13, 12:02
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Twinsuns orbit would be different, but the sunsets would be like this.
http://www.youtube.com/watch?v=o-XwP7qDuio

Here's my very old CG videos;
http://www.youtube.com/watch?v=PMyvYuwS0wg

Its a bit hard to see, but unlike the earth its rotating on two axis's at once. One vertical to the video - so the two sides stay pointing at the suns, the other along an imaginary line between the suns. This means (due to the curvature of the planet and the relative closeness of the suns) some ares can experience sunsets.

You only get sunsets like this at certain points though.
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Old 2014-02-13, 12:11
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I know that vid, but I still don't get how or why
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Old 2014-02-13, 20:55
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this help a bit?

(I admit I did the flare far too bright in the video, which doesn't help - you need to assume he sun is a bit smaller)
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Old 2014-02-13, 23:32
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... But according to this drawing, the guy on the north never sees the southern sun...
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Old 2014-02-13, 23:51
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See for example the Polar star. It is on the northern axis of the earth, from anywhere you are on the northern hemisphere, you always see it ! It does not rotate ! Plus someone on the norther hemisphere can't see the south cross...
(big image)
Spoiler:
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Old 2014-02-14, 00:09
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The pole star is wayyyyyyyyyyy further away though, the curvature of the earth stands no chance to block it out.
The diagram is supposed to show how if the sun is close enough, the curve of the earth can "clip" it so you don't see it.

Remember also its rotating on two axis's, not one.

I guess I should make a new better diagram when I have time. Previously I literally stuck the camera to the surface, so I know it works, but it is hard to illustrate.
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Old 2014-02-14, 00:50
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I know that you just stuck the camera to the planet, that's why I am clueless about this, else I would've said that you messed your animation up
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