As the sun rises and sets, the sky will partly be red, the sky is blue, and the polarized sky light (at least in part). This phenomenon can be explained on the basis of light scattering by atmospheric molecules. The scattering of light by the earth's atmosphere depends on the wavelength. For particles much smaller than the wavelength of light (such as air molecules), they are not a major obstacle to long wavelengths compared to short ones. The scattering is reduced, red and orange light scattered less than blue and purple, which is the cause of the blue sky. At sunset, on the other hand, the beam of sunlight passes through the maximum atmospheric length. Many of the blue colors have been removed by scattering. The light reaching the surface of the earth means blue flaws, which is the reason for the reddish sunsets.