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Dusk / Dawn

Sunrays have a long way through the atmosphere. If the sky is clear, especially the short wave parts of the light are scattered, the sky appears to be blue. If the sun is positioned deep over the horizon, the way through the atmosphere is longer, the blue part of the light is low, so especially the longwave red light is present. Clouds reflect the red light and colours the sky partly red.

Dusk
Dusk
Dawn
Dawn
Development of colored sky
Development of colored sky