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Published on Mar 3, 2008
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.
Green flashes can be observed from any altitude (even from the air). They are usually seen at an unobstructed horizon, such as over the ocean, but are possible over cloud-tops and mountain-top as well.