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Green flash
Meteorological optical phenomenon / From Wikipedia, the free encyclopedia
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The green flash and green ray are meteorological optical phenomena that sometimes occur transiently around the moment of sunset or sunrise. When the conditions are right, a distinct green spot is briefly visible above the Sun's upper limb; the green appearance usually lasts for no more than two seconds. Rarely, the green flash can resemble a green ray shooting up from the sunset or sunrise point.
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/2/2b/Development_of_Green_Flash.jpg/640px-Development_of_Green_Flash.jpg)
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/5/59/Inferior_Mirage_green_flash.jpg/640px-Inferior_Mirage_green_flash.jpg)
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/4/40/GreenFlash.jpg/640px-GreenFlash.jpg)
Green flashes occur because the Earth's atmosphere can cause the light from the Sun to separate, or refract, into different colors. Green flashes are a group of similar phenomena that stem from slightly different causes, and therefore, some types of green flashes are more common than others.[1]