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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 .
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 ...
[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 scale rates the darkness of the night sky inhibited by skyglow with nine classes and provides a detailed description of each position on the scale.
This is an extreme naked-eye target that pushes human eyesight and the Bortle scale to the limit [56] +7.25: planet Mercury: seen from Earth minimum brightness [42] +7.67 [57] planet Neptune: seen from Earth maximum brightness [42] (Neptune comes to perihelion in 2042) +7.78: planet Neptune: seen from Earth mean brightness [42] +8.00: planet ...
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.
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Considering that the World Atlas dates from 2000 and Bortle's article appeared in 2001, I don't think the Atlas was created with Bortle's scale in mind. 98.199.232.32 ( talk ) 06:55, 26 May 2011 (UTC) [ reply ]
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