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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 .
In order to describe how much light pollution there is at a particular location, astronomers classify night skies based on the Bortle Scale.
Location Area (in ha) 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
See the Bortle scale.) There is even variation within metropolitan areas. For those who live in the immediate suburbs of New York City, the limiting magnitude might be 4.0. This corresponds to roughly 250 visible stars, or one-tenth of the number that is visible under perfectly dark skies.
On clear nights around new moon, the sky darkness of Joshua Tree is rated a class 2–4 on the Bortle scale. [ 51 ] [ 52 ] This ranges from an "average dark sky" (class 2) in the easternmost region of the park to a sky quality typical of a rural/ suburban transition (class 4) in the western regions near Palm Springs .
The park has an astronomical observatory. The observatory site is located in a region rated 5 on the Bortle scale (i.e. the brightness scale of the night sky). This situation favors the observation of the sky because the site is surrounded by agricultural land.
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