Noun
skyglow (countable and uncountable, plural skyglows)
The illumination of the sky above populated areas, mostly by street lighting.
Direct skyglow is reduced by selecting lighting fixtures which limit the amount of light emitted above the horizontal (90° above the nadir ). Source: Internet
Because of the scatter of light by the atmosphere, different sources produce dramatically different amounts of skyglow from the same amount of light sent into the atmosphere. Source: Internet
Indirect skyglow produced by reflections from illuminated surfaces is harder to manage; the only effective method for limiting it is by minimizing over-illumination. Source: Internet
Most major optical astronomical observatories are surrounded by zones of strictly enforced restrictions on light emissions to limit skyglow. Source: Internet
The brightness of skyglow is affected strongly by the amount of light used, the shielding characteristics of the light fixtures, and by the color or spectral content of the light sources. Source: Internet