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A colorful sky over the South Seas; an image from Matira Point beach on the main islands of Bora Bora Lagoon.

There are some green rays in the sky.

*Scanned image*

Green flashes and green rays are rare optical phenomena that occur shortly after sunset or before sunrise, when a green spot is visible for a short period of time above the sun, or a green ray shoots up from the sunset point.
They could be observed from any altitude (even from the air). It is preferable to have an unobstructed view of the horizon, such as on the ocean, but it is not necessary. One could see a green flash as a cloud-top or a mountain-top too.

Its explanation lies in refraction of light (as in a prism) in the atmosphere and is enhanced by atmospheric inversions. Whilst we would expect to see a blue light, the blue is dispersed and only the green light remains visible.

With slight magnification a green rim on the top limb of the solar disk can be seen on most clear-day sunsets. However the flash or ray effects require a stronger layering of the atmosphere and a mirage which serves to magnify the green for a fraction of a second to a couple of seconds.

From Wikipedia

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Additional Photos by Paolo Motta (Paolo) Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 4211 W: 150 N: 9201] (40755)
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