why the color of the sky appears only in blue color?

Answer 1

This questions has been answered so many times - but it needs to be answered again because so many wrong myths still exist.
The blue sky is NOT a consequence of the blue ocean.

Even when you are a thousand miles from the sea in the middle of a desert the sky is still blue.

It is because the violet and the blue components of the white sunlight is scattered most. The green is scattered far less and the longer wavelength of yellow, orange, and red are able to penetrate a think and even hazy atmosphere best.

The result of this physical fact is that part of the white sunlight, most of violet and a bigger part of blue is scattered all over the upper part of the atmosphere. This scattering of light is taking place mainly at altitudes between 25km and 4km.

Our sun appears a bit yellowish because most of the violet components and a great part of the blue components are subtracted because they are use to light up the sky above our heads. If we add the direct sunlight and the scattered blue from the sky coming indirectly to us, we have again the complete white light.
The yellow, orange and red appearance of the rising or setting sun is a result of the light transitioning a much longer path through the upper atmosphere so that all violet, all blue, and a lot of green is subtracted.

Answer 2

The sky appears blue 'coz blue and violet are the colours that are most deviated. Therefore, you would never see a red sky during daytime 'coz red gets least deviated. Moreover, red is the most absorbent colour of the atmosphere and blue is the least.

Answer 3

If your sky only appears blue in color, then you have never been outside at night when it is black, or in the early morning when it is yellowish orange.

Answer 4

from the ocean's reflection.