Light pollution

anthropogenic light in the night environment, caused by excess or misdirected lighting

raised source of light on the edge of a road or walkway

the determination of light intensities of astronomical bodies, including stars

Type of lamp used for lighting

scale of night sky brightness

area that restricts artificial light pollution

environmental organization

permanent Hong Kong light and sound show

thumb|right|Mexico City at night, showing skyglow thumb|A map from 1996 to 1997 showing the extent of skyglow over Europe

episode of The Simpsons (S14 E16)

straying of waves in the radio and electromagnetic spectrums outside their allocations that cause problems for some activities, of particular concern to radio astronomers

citizen science project

property of light waves that describes the orientation of their oscillations

transboundary dark sky park

campaign to reduce light pollution

visual perception of the sky and how it scatters and diffuses light.

CieloBuio-coordinamento per la protezione del cielo notturno (Coordination for the protection of the night sky) is a non-profit organization that operates in Italy for the protection of the night sky by promoting a culture of eco-friendly lighting and raising public awareness about the phenomenon of light pollution.