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Sunsets. When the air is clear the sunset will appear yellow, because the light from the sun has passed a long distance through air and some of the blue light has been scattered away. If the air is polluted with small particles, natural or otherwise, the sunset will be more red.
(Copied from http://math.ucr.edu/home/baez/physics/General/BlueSky/blue_sky.html)
Written Jan 16, 2019Question Overview
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