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Light from the Sun is refracted and scattered as it passes through the atmosphere. The scattered light goes all over, and is at the higher or violet end of the visible spectrum; this scattering causes the sky to appear blue.

The refracted, or bent, light is more red than anything and is refracted downward toward the surface of the Earth. Light passing a long way through the atmosphere causes the red light to be bent down, a little bit AROUND the Earth; this is why sunrises and sunsets are usually reddish.

In the early morning and late afternoon, light has passed a long way through the atmosphere and the violet and ultra-violet light is scattered away, while the red light remains to color our sunsets.

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Q: Why do the UV rays decrease as the late afternoon and early evening approach?
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