Where Does the Green Go at Twilight?

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kompabt
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Why is no green color on the sky at twilight??
 
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Maybe you are not looking hard enough or maybe you are not looking at the right time at the right angle. I HAVE seen a horizontal trail of green, although this was at dusk, in the east sky. The stength of this green was not very strong, but it was recognizable.
 
Why is this intensity so low? In the rainbow the green's intensity is much greater.
 

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