Are Rainbows Half A Complete Circle ?

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Offline neilep

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Are Rainbows Half A Complete Circle ?
« on: 26/12/2007 20:40:40 »
Dear Rainbowologists,

See this Rainbow ?


[attachment=1913]

Nice eh ?...notice how semi circular and arc shaped it is ?


But, if I was to lift the rainbow up high into the sky...would it be a complete circle ?...or are Rainbows only arc shaped ?
« Last Edit: 28/12/2007 23:00:03 by neilep »
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paul.fr

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Re: Are Rainbows Half A Complete Circle ?
« Reply #1 on: 27/12/2007 17:47:27 »
sort of, rainbows are a complete circle. The reason you can not see the whole circle is because it is blocked by the horizon.

looking at that picture, i also see a Supernumerary to the right and a faint alexanders band between the double rainbows...nice.

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paul.fr

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Re: Are Rainbows Half A Complete Circle ?
« Reply #2 on: 27/12/2007 17:49:42 »
here is a quote by Dave, from another topic.

"A rainbow allways forms in a circle about 21 around the point directly opposite the sun, normally at least half of this circle should be below you and there is little rain below ground so you don't see it. It also means that a rainbow could only be directly below you if the sun was directly above you, as clouds are normally required to be above rain this is quite unlikely even if you were at the equator.

However in a plane if you are high enough up that there is enough rain 21 below the horizontal to produce a good rainbow you will see a circular rainbow although it won't be below you."

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Offline neilep

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Re: Are Rainbows Half A Complete Circle ?
« Reply #3 on: 28/12/2007 16:15:09 »
THANK EWE PAUL (and DAVE via PAUL).....I'd luff to see a full round rainbow !!...seems pointless that science laws should allow for full round rainbows only to deny us from seeing them for most of the time !

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Offline turnipsock

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Re: Are Rainbows Half A Complete Circle ?
« Reply #4 on: 28/12/2007 21:53:34 »
Ranbows normally come in twos with the one having it colours reversed. There is also a dark band between the two.

Is it possible for the moon to create a rainbow and would we see it?

If it did, would the bands of colour be the same thicknes?
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When things are in 3D, is it always the same three dimensions?

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Offline neilep

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Are Rainbows Half A Complete Circle ?
« Reply #5 on: 28/12/2007 23:01:14 »
Ranbows normally come in twos with the one having it colours reversed. There is also a dark band between the two.

Is it possible for the moon to create a rainbow and would we see it?

If it did, would the bands of colour be the same thicknes?

Yes yes...I noticed a while ago and posted this question about the colour reversal....excellent..thank ewe Turnipsock !     http://www.thenakedscientists.com/forum/index.php?topic=11533.0
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