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Why is the Colour of the Clear Sky Blue?

The colour of the clear sky is blue because molecules in the air scatter blue light from the sun more than they scatter red light. When we look towards the sun at sunset, we see red and orange colours because the blue light has been scattered out and away from the line of sight.
The white light from the sun is a mixture of all colours of VIBGYOR. The colours of light are distinguished by their different wavelengths. The visible part of the spectrum ranges from red light with a wavelength of about 720 nm, to violet with a wavelength of about 380 nm, with orange, yellow, green, blue and indigo between. 
According to Rayleigh Scattering law, the scattering of light is inversely proportional to the fourth power of its Wavelength.
Colour of the Sun at Sunrise and Sunset
Light from the Sun near the horizon passes through thicker layers of air and larger distance so it appears red. At noon, the Sun appears White as only a little of the blue and violet colours are scattered.

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