Question

what is the sky blue? ​

Answer 1

Answer: Sky blue is a colour that resembles the colour of the unclouded sky at noon reflecting off a metallic surface. The entry for "sky-blue" in Murray's New English Dictionary reports a first sighting of the term in the article on "silver" in Ephraim Chambers's Cyclopaedia of 1728. Wikipedia

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Answer 2

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Earth's atmosphere, the dominant scattering efficiency of blue light is compared to red or green wavelengths. Scattering and absorption are major causes of the attenuation of sunlight radiation by the atmosphere. During broad daylight, the sky is blue due to Rayleigh scattering, while near sunset, and especially during twilight, absorption of irradiation by ozone helps maintain blue color in the evening sky. At sunrise or sunset, tangentially incident solar rays illuminate clouds with orange-to-red hues.