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Keyword: blue flash
![Синий луч](https://images.astronet.ru/pubd/2002/01/10/0001174093/blueflash_cogo.preview.jpg)
9.01.2002
Difficult to observe, the momentary green flash above the rising or setting sun has been documented as a phenomenon caused by the atmospheric bending or refraction of sunlight. Like a weak prism, the Earth's atmosphere breaks white sunlight into colors, bending red colors slightly and green and blue colors through increasingly larger angles.
![Северный зелёный луч](https://images.astronet.ru/pubd/2012/06/23/0001266305/GS_20120621_GreenFlash_strand.preview.jpg)
23.06.2012
As seen from Frösön island in northern Sweden the Sun did set a day after the summer solstice. From that location below the arctic circle it settled slowly behind the northern horizon.
![Зелёный луч](https://images.astronet.ru/pubd/2011/01/04/0001249023/greenflash_manzona.preview.jpg)
4.01.2011
Many think it is just a myth. Others think it is true but its cause isn't known. Adventurers pride themselves on having seen it. It's a green flash from the Sun. The truth is the green flash does exist and its cause is well understood.
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