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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.
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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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.
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