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A sunset is the time at which the Sun disappears below the horizon in the west. Rayleigh scattering by atmospheric dust, preferentially affects short wavelength, blue light. During the day, this gives the sky its blue hue, but at sunset, when the sun is close to the horizon, the blue light is scattered away from the line of sight, leaving red, orange and yellow light to illuminate the sky and clouds. Photo credit: Fir0002 |
