In addition to what people are saying about the atmosphere, there’s also the movement of the earth. Due to the spin of the earth, you are moving towards the sun in the morning and away from it in the evening. When you move toward the sun, the wavelengths of light are ‘crunched.’ By bringing yourself closer, there’s less time between waves. Similarly light is ‘stretched’ in the evening because you are going away from it. This change in movement effects your interaction with the light and therefore what you see
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