Why does the sun look red when it rises and sets?

All the colors of the rainbow are mixed in different amounts of sunlight. Sunlight comes to us through the Earth's atmosphere. The atmosphere obstructs the path of light. This barrier is not the same for all colors. In the case of red, the barrier is the least. Different colored light from the sun mixes in different proportions and overcomes various obstacles and turns into a yellow color.

The depth of the atmosphere is not always the same. This is why the sun looks different at dawn or dusk. In the case of red, the barrier is quite low. So the sun looks red. In fact, the whole thing happened to scatter light. When a light wave falls on a tiny particle, the particles scatter the light wave in different directions. This is called scattering of light. The scattering of this light causes light of different wavelengths and this is why different colors emerge. The shortest wavelength of blue light is the most scattered and the shortest wavelength of red light is the least scattered. During sunrise and sunset the sun is almost close to the horizon and sunlight has to penetrate the thick layer of the earth's atmosphere to reach our eyes. As a result, the shorter wavelengths of the blue edge are scattered as the light ray passes through the floating dust, water particles, etc. in the atmosphere, but the longer the wavelength of the light on the red edge, the less scattered it is, so it travels directly to Earth. So we see the rising sun in the morning and the setting sun in the evening in red.