WHY the color of the sky changes?

We all see the color of sky gradually changes after the intervals of time.

ANYBODY KNOWS WHY DOES THIS HAPPENS???
   When the light disperse(splits into seven colours),it produces seven different colors violet, Indigo, blue, green,Orange and red. As shown below.

                           The blue color consist of the shortest wavelength therefore it can scatter (move) easily through the tiny particles of air and also due to short wavelength it travels more in the atmosphere and hence we see the color of sky 'BLUE'.

  And the reason for red color in the evening is that the red color has the longest wavelength and do not scatter much, at the time of evening,sun is far away from earth so only those colors travel whose wavelengths are more . since colors like violet ,Indigo and blue has very short wavelength therefore they cannot reach.Hence in the color of the sky appears to be 'RED'.

Actually the color of the sky is not exactly blue or red there are different rays that get dispersed like infrared rays, ultraviolet rays, Gamma rays, microwaves,radiowave,X rays etc. But we can't see the color of dispersion of these beam.

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