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Amateur astronomer John E. Bortle created the scale and published it in the February 2001 edition of Sky & Telescope magazine to help skywatchers evaluate the darkness of an observing site, and secondarily, to compare the darkness of observing sites. The scale ranges from Class 1, the darkest skies available on Earth, through to Class 9, inner ...
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.
Darkness is the condition resulting from a lack of illumination, or an absence of visible light. Human vision is unable to distinguish colors in conditions of very low luminance because the hue -sensitive photoreceptor cells on the retina are inactive when light levels are insufficient, in the range of visual perception referred to as scotopic ...
The Bortle scale is a nine-level measuring system used to track how much light pollution there is in the sky. A Bortle scale of four or less is required to see the Milky Way whilst one is "pristine", the darkest possible.
Bortle Scale Status Notes Australia: The Jump-Up, Australian Age of Dinosaurs: Queensland: 1,400 1–2 Dark Sky Sanctuary Designated on April 27, 2019 Australia: Warrumbungle National Park: New South Wales: 23,312 1 Dark Sky Park Designated on July 4, 2016 Australia: Arkaroola Wilderness Sanctuary: South Australia: 63,000 Dark Sky Sanctuary
All measurements of night sky luminance in the core area are darker than 21.3 mag/arcsec 2 (corresponding to Bortle scale 3), and in places are as dark as 21.8 mag/arcsec 2 (Bortle scale 1). Large parts of the Wairarapa region outside the core of the reserve exceed the minimum value of 21.2 mag/arcsec 2 required for the core.
2.1 Darkness. 3 References. 4 External links. Toggle the table of contents. ... The sky quality of that park expressed by the Bortle scale is at level 4, ...
[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.