WHY is the sun red during rise and set

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SUMMARY

The sun appears red during sunrise and sunset due to Rayleigh scattering, which affects the light's wavelength as it travels through the Earth's atmosphere. At these times, the light path is longer compared to midday, causing shorter wavelengths (blue light) to scatter away, leaving predominantly red wavelengths visible. The angle of the sun's light also contributes to this phenomenon, as the incident light during these times differs significantly from that at noon.

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during the sunrise and sunset, we find the sun reddish in color...why is it so...my view is that as the distance to Earth during these times is longer than mid-day, and applying doppler effect, as the sun nears the apparent wavelength decreases and so is the perceived color...is this approach true...
 
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It's not doppler effect. It is because of the scattering effect. The Rayleigh scattering is strong at shortwave light so you can see lots of red beams. During the sunrise and sunset, the light has to travel more in air than it does at noon.
 
it is because of scattering of light with particles in the atmosphere. During Sunrise and sunset, the angle of the incident light from the sun is different from when it is noon... in a layman picture, you have during noon, blue light is being scattered "onto" the atmosphere while during sunset/rise, blue light is being scattered "away" and you see only the redder end of the spectrum. It is also true that light has to travel through more air (because of the angle) during sunset/rise as haiha said.
 

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