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Sick of cyan-blue skies
RichA wrote:
I don't know what planet some people think we live on, or maybe it's that some people have a restricted range of colour vision, but Earth skies are NOT cyan, they are blue and should look blue in pictures. As far as I know, there is no green component in the oxygen-scattering of blue light in the atmosphere. You should get out more or read more physics textbooks. At sunset and later (or sunrise and earlier) there's often plenty of green to be seen in the lower regions of the sky. -- Chris Malcolm |
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Sick of cyan-blue skies
On 26 Nov 2009 04:14:36 GMT, Chris Malcolm wrote:
: RichA wrote: : : I don't know what planet some people think we live on, or maybe it's : that some people have a restricted range of colour vision, but Earth : skies are NOT cyan, they are blue and should look blue in pictures. : As far as I know, there is no green component in the oxygen-scattering : of blue light in the atmosphere. : : You should get out more or read more physics textbooks. At sunset and : later (or sunrise and earlier) there's often plenty of green to be : seen in the lower regions of the sky. Among other things, the sky is a pretty good reflector. For example, the phenomenon of "Gegendämmerung" (of which my wife and I once submitted some examples to the Shoot-In) involves the reflection of a sunset on another part of the sky. Is it possible that a reflection of woods or other vegetation might contribute some green to an otherwise blue sky? Bob |
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Sick of cyan-blue skies
Robert Coe wrote:
Among other things, the sky is a pretty good reflector. For example, the phenomenon of "Gegendämmerung" (of which my wife and I once submitted some examples to the Shoot-In) involves the reflection of a sunset on another part of the sky. Is it possible that a reflection of woods or other vegetation might contribute some green to an otherwise blue sky? Possible. But the phenomenon that is wellknown among sailors as the "green flash" has nothing to do with reflection off vegetation but is caused purely by refrection of the sunlight in the atmosphere jue |
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Sick of cyan-blue skies
On Thu, 26 Nov 2009 21:47:47 -0500, Robert Coe wrote:
On 26 Nov 2009 04:14:36 GMT, Chris Malcolm wrote: : RichA wrote: : : I don't know what planet some people think we live on, or maybe it's : that some people have a restricted range of colour vision, but Earth : skies are NOT cyan, they are blue and should look blue in pictures. : As far as I know, there is no green component in the oxygen-scattering : of blue light in the atmosphere. : : You should get out more or read more physics textbooks. At sunset and : later (or sunrise and earlier) there's often plenty of green to be : seen in the lower regions of the sky. Among other things, the sky is a pretty good reflector. For example, the phenomenon of "Gegendämmerung" (of which my wife and I once submitted some examples to the Shoot-In) involves the reflection of a sunset on another part of the sky. Is it possible that a reflection of woods or other vegetation might contribute some green to an otherwise blue sky? Bob This is why skies also turn green before a tornado. The low-glancing late sun coming under the dense cloud-layer, at the back of the east-traveling storm clouds. Tornadoes generally form at the back-end of the advancing tornado producing storm-clouds (cumulus mammatus), just before the clearing behind them. That sunlight reflecting off of green vegetation and brown lands turns the bottoms of those dense storm clouds into a sickly green. Those who live where tornadoes are common know very well of this gut-sickening sky color. It means it's time to get real nervous real fast. |
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