When sunlight strikes the atmosphere it is scattered, and sometimes split into its component colors, by water droplets, ice crystals and dust particles in the air, causing a variety of optical illusions.
A green flash can occur at sunrise or sunset when some part of the Sun suddenly and briefly seems to change color from red or orange to green or blue. This is an optical effect caused by the larger refraction of light at the blue/ green end of the spectrum…
Read » Wonders of The Natural World – Atmospheric Optical Effects



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