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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.
Bortle, John E. (February 2001). "The Bortle Dark-Sky Scale". Sky & Telescope. Sky Publishing Corporation. Archived from the original on 31 March 2014 "Telescopium, constellation boundary". The Constellations. International Astronomical Union; Kaler, Jim. "Alpha Telescopii". Stars. University of Illinois
A light pollution map such as lightpollutionmap.info can help identify the nearest dark-sky location, which, in my case, is hours away. These maps often use the Bortle dark-sky scale, ...
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 star clouds of the Milky Way hang over the Cape Lookout Lighthouse and its keepers' quarters in this Oct. 2, 2021, photo. The Cape Lookout area is a designated dark sky site where light ...
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 ...
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