During sunrise and sunset the distance that the light has to travel from the Sun to an observer is at its greatest. This means the a large amount of blue and violet light has been scattered so the light that is recieved by an observer is mostly of a longer wavelength and therefore appears to be red. read more
The visible light’s rays are white and consist of seven colours – violet, indigo, blue, green, yellow, orange and red (known simply as VIBGYOR). The earth’s dust, gas and air particles scatter the sun’s light in different directions. read more