Question

Why do we observe changes in colour of sun at sunrise,sunset and noon?

Answer 1

At Sunrise Red and Orange colour.
At Sunset Red colour.
At noon Yellow and Orange colour.

Answer 2

The colour of sun is reddish at the time of sunrise and sunset whereas at noon the sun appears white. At sunrise and sunset the light coming from the sun has to travel a longer distance through the atmosphere to reach us. Therefore the blue and green components of white light are gets scattered away (removed)almost completely leaving the longer wavelength. Hence, during sunrise and sunset the sun appears reddish.When the sun is overhead at noon, then the light coming from the sun has to travel a relatively shorter distance through the atmosphere to reach us. As a result, only a little of the blue colour of the white light is scattered (most of the blue light remains in it). Since the light coming from the overhead sun has almost all its components colours in the right proportion, therefore, the sun appears white.............