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Sunset

In the evening, as the sun approaches the horizon, sunlight no longer penetrates the atmosphere vertically but at a shallow angle through a thicker layer of the atmosphere. During this process, shorter-wavelength light, such as blue and violet, is scattered in other directions. Meanwhile, longer-wavelength red and orange light, which is less easily scattered, passes directly through the atmosphere and reaches our eyes. As a result, the sun appears vividly red.