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It is calculated as the fraction of the actual total solar radiation on the surface of the Earth during a certain period over the theoretical maximum (i.e., clear sky) radiation during the same period. [1] [2] The clearness index is a dimensionless quantity and can vary from 0 (sky is completely covered) to 1 (perfectly sunny). [3]
Moonlight, [4] clear night sky: 0.25 lux: A full Moon, clear night sky [5] [6] 0.01 lux: A quarter Moon, clear night sky 0.002 lux: Starlight, clear moonless night sky, including airglow [5] 0.0002 lux: Starlight, clear moonless night sky, excluding airglow [5] 0.00014 lux: Venus at brightest, [5] clear night sky 0.0001 lux: Starlight, overcast ...
The blue sky spectrum contains light at all visible wavelengths with a broad maximum around 450–485 nm, the wavelengths of the color blue. Diffuse sky radiation is solar radiation reaching the Earth's surface after having been scattered from the direct solar beam by molecules or particulates in the atmosphere.
A Starlink "satellite train" is seen in the skies over Pennsylvania shortly after dusk, Saturday, Nov. 18, 2023, in Gettysburg.
Clear Sky Charts (called clocks until February 29, 2008) are web graphics which deliver weather forecasts designed specifically for astronomers. They forecast the cloud cover , transparency and astronomical seeing , parameters which are not forecast by civil or aviation forecasts. [ 1 ]
It is approximately 80%, which is a realistic maximum for the clear Rayleigh sky during day time. The video thus begins when the sun is slightly above the horizon and at an azimuth of 120°. The sky is highly polarized in the effective North-Zenith-South plane. This is slightly offset because the sun's azimuth is not due East.
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