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It is due to the phenomenon of atmospheric scattering of light.

Explanation: First, it is important to know that of all the seven colors that make up white light, red has the maximum wavelength and violet (Also, indigo and blue) has the least wavelength.

Now, imagine a big sphere to be our Earth and imagine yourself standing right on top of the Earth's surface (In this case a sphere). Now, during noon, the sun is overhead i.e., the distance needed to travel by the light from the sun to you is less. Thus, the color of least wavelength- blue( violet and indigo too, but blue has a higher frequency) gets scattered in the atmosphere and hence the sky appears blue in the noon. But, in the morning and evening, the sun is at a side. It is not right over your head. So, then the light needs to travel a longer distance. In such a condition, all the blue color gets scattered away and lose their brightness. The remaining colors are of the red family and hence the sky appears reddish- orange.

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11y ago
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Q: Why does the sun looks reddish yellow in mornings and evenings why not in afternoons?
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