Bortle scale
Scale of night sky brightness
Nº Q2722595 ★★
Uncommon · Knowledge
Bortle scale
Scale of night sky brightness
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 characterizes the observability of celestial objects, taking into account the interference caused by light pollution.
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From Wikipedia
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 characterizes the observability of celestial objects, taking into account the interference caused by light pollution. Amateur astronomer John E. Bortle created the scale and published it in the February 2001 edition of Sky & Telescope magazine to help skywatchers evaluate and compare the darkness of night-sky observing sites.
Text: Wikipédia, CC BY-SA 4.0. · Image: ESO/P. Horálek, M. Wallner (CC BY 4.0) ·
