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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 park is well known for its naturally dark night skies, which are far away from and largely free of the light pollution typical in urban areas. In 2017, the International Dark-Sky Association designated Joshua Tree a Dark Sky Park. [50] On clear nights around new moon, the sky darkness of Joshua Tree is rated a class 2–4 on the Bortle scale.
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 ...
This new map covers around 11 billion years of cosmic history that was essentially unexplored, teaching us about dark energy like never before. SDSS telescope. Sloan Digital Sky Survey/wikipedia ...
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.
The dog was so confused. Dad's jacket was on, but they weren't going for a stroll — what gives?!. Related: Newfoundland Believing She Gave Birth to Bunnies Is the Sweetest Thing All Week
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