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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 .
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
Location and purpose ... The sky quality of that park expressed by the Bortle scale is at level 4, and reaches level 3 under exceptionally good conditions. [9] [10]
In order to describe how much light pollution there is at a particular location, astronomers classify night skies based on the Bortle Scale.
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.
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.
Oxford Observatory at foothills. In 2024, the conservation area was designated by DarkSky International as New Zealand's second International Dark Sky Park. [6] [7] Readings of night sky luminance in the park have a median value of 21.45 mag/arcsec 2 (corresponding to Bortle scale 3), and in places are as dark as 21.76 and 21.80 mag/arcsec 2 (Bortle scale 1).
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