It does form a circle. If you stand with your back to the sun and spray some water in front of you in a fine mist, you can see the full circle.
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And when you finally see the whole circle, you also see ALL of the colors!
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Ok, decided to give it another shot, and found National Geographic’s pretty great Rainbow explainer. The third slide shows a full circle, and confirms / lightly explains the lighter color on the interior. Man I love a good organization’s general “resources” website section. So often skipped over by search results, but when you find a good, well-organized one, they are the best of the web.
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The center of a rainbow’s arc can be marked by a line running from the sun, straight through the observer’s third eye. That’s another reason rainbows are so interesting – they look like they are huge and “out there”, but really they are “located” inside the viewer.
The rainbow’s center is the head of the photographer’s shadow, or technically the camera’s shadow.
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You have a double rainbow there. Lovely. I’ve seen these once or twice.
Now a brief, idiotic story: Back in the long-ago, a friend of mine also claimed to have seen a double rainbow but, unlike the one above, two rainbows that crossed over each other.
Y’know, from our other sun.
(name witheld, I’m not evil)
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Thank you for that link. Fascinating.
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I just visited after that post.
Well worth it.
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Should I instead use my butt to push the handson?
Recent visitors:
That snake showed up in the garage just a day or two after I had to shoo a much smaller serpent out of the driveway (lest it be flattened by wheels).
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That looks sketchy
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What does the “F” stand for: Fizza rather than Pizza?
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Finnish?
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Maybe F for France (doesn’t work in Finnish as France is called Ranska). Their website didn’t say.
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Fast? (“Fast pizza” → “Fizza”.)
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@MrShiv, @vermes82, @Murgatroyd:
Thanks for your ideas! I think @MrShiv might have it, although they don’t actually explain it:
Despite the lack of an explanation, I’d say F for Finland makes sense.
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Do you know why? I can understand the “anska” part, but why R instead of F?
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It comes from “Franska” but since Fr is uncommon in Finnish it was replaced with just R.
Source
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So helpful, thanks!
I suppose I should have checked Wikipedia myself, huh? 
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