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| Dawn Star: The Green Flash |
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Green flashFrom Wikipedia, the free encyclopedia This article is about the optical phenomenon. For other uses, see Green flash (disambiguation). ![]() A larger-than-usual green flash in Santa Cruz, California ![]() A mock-mirage green flash observed inSan Francisco, California Green flashes and green rays are optical phenomena that occur shortly after sunset or before sunrise, when a green spot is visible, usually for no more than a second or two, above the sun, or it may resemble a green ray shooting up from the sunset point. Green flashes are a group of phenomena stemming from different causes, and some are more common than others. They usually are seen at an unobstructed horizon, such as over the ocean. |












