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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.
With two eclipses and several meteor showers coming up, an astronomy professor shares travel tips for viewing astronomical phenomena.
For an epic stargazing outing, head to one of these 10 Dark Sky destinations across the country for incredibly clear views of the heavens.
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 ]
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, ...
The best way to see the Milky Way is from one of Michigan's dark sky parks, situated away from major sources of light pollution. Keep in mind that as state parks, some dark sky parks may require a ...
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