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The color of light from the sky is a result of Rayleigh scattering of sunlight, which results in a perceived blue color. On a sunny day, Rayleigh scattering gives the sky a blue gradient, darkest around the zenith and brightest near the horizon.
Rayleigh scattering causes the blue color of the daytime sky and the reddening of the Sun at sunset. Rayleigh scattering (/ ˈ r eɪ l i / RAY-lee) is the scattering or deflection of light, or other electromagnetic radiation, by particles with a size much smaller than the wavelength of the radiation.
View of the night sky in July The day's blue sky, clouds and the Moon. The sky is an unobstructed view upward from the surface of the Earth. It includes the atmosphere and outer space. It may also be considered a place between the ground and outer space, thus distinct from outer space.
A combination of factors from the time of day to dust in the sky can affect what parts of the visible light spectrum we can and can't see. There's a reason the sky is yellow, green during a storm ...
The sky actually appears to be blue less than half the time. Some conditions under which the sky may not appear blue: During the night, the sky appears black. Without light from the sun creating Rayleigh scattering, the sky cannot be seen as blue, [3] except in certain conditions when the moon is up. [4] Clouds can obscure the color of the sky.
The color perceived is similar to that presented by a monochromatic blue (at wavelength 474–476 nm) mixed with white light, that is, an unsaturated blue light. [5] The explanation of blue color by Lord Rayleigh in 1871 is a famous example of applying dimensional analysis to solving problems in physics.
Deep sky blue is an azure-cyan colour associated with deep shade of sky blue. Deep sky blue is a web colour. This is the colour on the colour wheel (RGB/HSV colour wheel) halfway between azure and cyan. [34] The colour name deep sky blue came into use with the formulization of the X11 colour names over 1985–1989.
Sky brightness refers to the visual perception of the sky and how it scatters and diffuses light. The fact that the sky is not completely dark at night is easily visible. If light sources (e.g. the Moon and light pollution ) were removed from the night sky , only direct starlight would be visible.