Optical phenomena that sometimes occur right after sunset or right before sunrise.
A green flash is and optical phenomena that is sometimes seen during a sunset or sunrise. It's most often seen on a clear, unobstructed horizon such as an ocean.
It is enhanced by a mirage (a naturally occurring optical phenomenon, in which light rays are bent to produce distorted or multiple images of an astronomical object) and is most likely to be seen in clear air conditions when more light for the setting or rising sun is seen without being scattered. A green flash lasts for only a second or two so you really have to keep an eye on that sunset (safely!) if you want a chance of experiencing it.
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