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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.
Diagram showing displacement of the Sun's image at sunrise and sunset Comparison of inferior and superior mirages due to differing air refractive indices, n. Atmospheric refraction is the deviation of light or other electromagnetic wave from a straight line as it passes through the atmosphere due to the variation in air density as a function of height. [1]
When the Sun drops more than 18° below the horizon, the sky generally attains its minimum brightness. [19] Several sources can be identified as the source of the intrinsic brightness of the sky, namely airglow, indirect scattering of sunlight, scattering of starlight, and artificial light pollution.
The Rayleigh sky model describes the observed polarization pattern of the daytime sky. Within the atmosphere, Rayleigh scattering of light by air molecules, water, dust, and aerosols causes the sky's light to have a defined polarization pattern. The same elastic scattering processes cause the sky to be blue.
Before answering why the sky is purple, here's a quick rundown as to why the sky is blue. ... the angle of the sun in the horizon yields more atmosphere and aerosols for which the light can be ...
Morning sky: Very bright Venus rises in the east around 5 a.m. in early January and around 6 a.m. late in the month. Mercury and Mars joined Venus low in the east in late December.
Yellow skies are a natural, but rare phenomenon. For premium support please call: 800-290-4726 more ways to reach us
A colorful sky is often due to indirect sunlight being scattered off air molecules and particulates, like smog, soot, and cloud droplets, as shown in this photo of a sunset during the October 2007 California wildfires. Atmospheric optics is "the study of the optical characteristics of the atmosphere or products of atmospheric processes ....