The reason for the reddish sunsets and dawns is Rayleigh scattering. The colors have different wavelengths. For example, blue has a short wavelength, so it isn’t scattered so much. In the mean time, red light has a short wavelength and scatters in the atmosphere when it travels for a while. When the Sun is high, the blue light takes a shorter route through the atmosphere and gives the sky a blue color. When the Sun is lower, the light has to travel through the atmosphere for longer and the blue light is scattered while the red one remains.
What Causes the Red Sky during Dawn and Sunset?
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