The reddish color of the sky - whether in the morning or evening - is caused by the scattering of sunlight. When the sunlight shines through the atmosphere onto the earth, the individual light rays are scattered, i.e. deflected, by the gas, dust and water particles in the atmosphere.
In the process, the white light splits into its components - the rainbow colors. This is because light rays of the individual colors are deflected to different degrees. The more energetic the light, the stronger the deflection. Blue light, for example, is short-wave and high-energy - it is therefore deflected more strongly than the lower-energy orange and red light.
Let us now imagine the sun in the morning or evening sky. From it, mainly the flat light rays reach our eye, which are deflected little - that is, the reddish ones. The others - the blue and green parts of the light are present, but they are scattered in completely different directions. That is why we do not see them.
For this reason, the evening and morning sun usually appears reddish. But if the sky is red over a large area, there is usually something else, namely dust and water droplets in the air, on which the flat light rays are scattered once again. So the sky is usually red when clouds are present at the same time - even if they are veil clouds.
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