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Globe at Night is an international scientific research program that crowdsources measurements of light pollution in the night sky. At set time periods within each year, the project asks people to count the number of stars that they can see from their location and report it to the project's website.
This article contains links to lists of lighthouses around the world. [1] [2] According to Lighthouse Directory, there are more than 18,600 lighthouses worldwide. [3
Light pollution is the presence of any unwanted, inappropriate, or excessive artificial lighting. [1] [2] In a descriptive sense, the term light pollution refers to the effects of any poorly implemented lighting sources, during the day or night. Light pollution can be understood not only as a phenomenon resulting from a specific source or kind ...
Another early example of this system is the world map by ‛Ali b. Ahmad al-Sharafi of Sfax in 1571. [3] The projection appears in many Renaissance maps, and Gerardus Mercator used it for an inset of the north polar regions in sheet 13 and legend 6 of his well-known 1569 map.
Les Eclaireurs Lighthouse (the French name "Les Éclaireurs" means "the Scouts") is a slightly conically shaped lighthouse standing on the northeasternmost island of the five or more Les Eclaireurs islands, which it takes its name from, 5 nautical miles (9 km) east of Ushuaia in the Beagle Channel, Tierra del Fuego, southern Argentina.
For example, a lightmap scale of 4 lumels per world unit would give a lower quality than a scale of 16 lumels per world unit. Thus, in using the technique, level designers and 3d artists often have to make a compromise between performance and quality; if high resolution lightmaps are used too frequently then the application may consume ...
Maps show where the northern lights may be visible over the United States. ... Dark, cloudless skies with little artificial light provide the best viewing experience.
Each volume of the Light List contains aids to navigation in geographic order from north to south along the Atlantic coast, from east to west along the Gulf coast, and from south to north along the Pacific coast. It lists seacoast aids first, followed by entrance and harbor aids listed from seaward.