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Earth Hour is a worldwide movement organized by the World Wildlife Fund (WWF). The event is held annually, encouraging the individuals, communities, and businesses to give an hour for Earth, and additionally marked by landmarks and businesses switching off non-essential electric lights, for one hour from 8:30 to 9:30 p.m., usually on the last Saturday of March, as a symbol of commitment to the ...
Lights can simply be turned off or light can sometimes be minimized by tarring the windows of large public structures. In World War II, a dark blackout curtain was used to keep the light inside. Tarring the windows can mean a semi-permanent blackout status. During the 1940s and 1950s, cities such as Detroit would practise blackout air raid drills.
Mexico City at night, showing skyglow A map from 1996 to 1997 showing the extent of skyglow over Europe. Skyglow (or sky glow) is the diffuse luminance of the night sky, apart from discrete light sources such as the Moon and visible individual stars. It is a commonly noticed aspect of light pollution.
A light-on-dark color scheme (dark mode, night mode) is available to Wikipedia's smartphone apps and website (for users using the default skins) since July 2024.. In addition to this there is a gadget on English Wikipedia, and various volunteer-written CSS files that allow customization for logged-in users.
The most universal type of light is the headlight, which is included on the front of locomotives, and frequently on the rear as well. [2] Other types of lights include classification lights, which indicate train direction and status, and ditch lights, which are a pair of lights positioned towards the bottom of a train to illuminate the tracks.
Cities are exploring more efficient energy use, reducing streetlight power consumption by dimming lights during off-peak hours and switching to LED streetlights which illuminate a smaller area to a lower level of luminance. [87] Many councils are using a part-night lighting scheme to turn off lighting at quieter times of night.
@Volker E. (WMF): With Vector, and "use legacy vector" selected, the left navigation area (just below the Wikipedia logo) as well as the entire bottom section (where the privacy policy, about wikipedia, disclaimers and so are contained) still have white-ish backgrounds (but the text appears to switch to colors designed to be on black/dark).
People usually use nightlights for the sense of security which having a light on provides, or to relieve fear of the dark, especially in young children.Nightlights are also useful to the general public by revealing the general layout of a room without requiring a major light to be switched on, for avoiding tripping over stairs, obstacles, or pets, or to mark an emergency exit.