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The Bortle dark-sky scale (usually referred to as simply the Bortle scale) is a nine-level numeric scale that measures the night sky's brightness of a particular location. It quantifies the astronomical observability of celestial objects and the interference caused by light pollution .
John E. Bortle is an American amateur astronomer. He is best known for creating the Bortle scale to quantify the darkness of the night sky. Bortle has made a special study of comets. He has recorded thousands of observations relating to more than 300 comets. From 1977 until 1994 he authored the monthly '"Comet Digest" in Sky and Telescope magazine.
All-sky maps of skyglow brightness are produced with professional-grade imaging cameras with CCD detectors and using stars as calibration sources. [10] [11] Amateur astronomers have used the Bortle Dark-Sky Scale to approximately quantify skyglow ever since it was published in Sky & Telescope magazine in February 2001. [12]
The Alabama Hills feature exceptional skies for Central California. It is Bortle class 2 or "average dark sky" site; this low level of light pollution meets or exceeds conditions in many of other popular nearby areas for amateur astronomy, such as Joshua Tree National Park (Bortle class 2–4). [13]
The night sky brightness in the reserve ranks at a level 2 on the nine-level Bortle Dark-Sky Scale, representing a truly dark site with high astronomical observability of celestial objects. [5] [6] The low level of light pollution in the area of the reserve has been supported by a lighting by-law that was included in the Mackenzie District Plan ...
Anywhere north of the red line on the map has chance to see the aurora. Historically, the best time to see the lights is between 10 p.m. and 2 a.m. ... The Dark Sky Map shows the areas in Iowa ...
The sky at Cherry Springs has been classified as a 2 on the Bortle Dark-Sky Scale, meaning it has almost no light pollution. [52] Such "truly dark, starry skies are unavailable to two-thirds of the world's population, including 99 percent of people in the continental U.S. and Western Europe". [3]
Interactive maps, databases and real-time graphics from The Huffington Post
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