green flash

green flash
A rare phenomenon observed in morning or evening when the sun is crossing or immediately below the horizon, in which a momentary flash or ray of green light appears above the upper rim of the solar disk, caused by refraction of light in the atmosphere.

Frank T. Davies, physicist on board the City of New York, en route to the Antarctic regions with Byrd Antarctic Expedition, reports as follows on a green flash observed off Bermuda on the evening of August 29, 1928.


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  • green flash — n. a sudden, bright flash of greenish light sometimes visible near the horizon at sunset or sunrise on a clear day, caused by the atmospheric refraction of sunlight …   English World dictionary

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  • green flash — noun Date: 1912 a momentary green appearance of the uppermost part of the sun s disk at sunrise or sunset that results from atmospheric refraction …   New Collegiate Dictionary

  • green flash — a green coloration of the upper portion of the sun, caused by atmospheric refraction and occasionally seen as the sun rises above or sinks below the horizon. [1910 15] * * * …   Universalium

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