bn:15145210n
Noun Concept
Categories: Light pollution, Scales, Amateur astronomy
EN
Bortle scale  Bortle Dark-Sky Scale  Bortle Dark Sky scale  Bortle  Bortle ranking
EN
The Bortle scale is a nine-level numeric scale that measures the night sky's brightness of a particular location. Wikipedia
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EN
The Bortle scale is a nine-level numeric scale that measures the night sky's brightness of a particular location. Wikipedia
A scale of night sky brightness. Wikidata
A nine-level numeric scale that measures the night sky's brightness of a particular location. Wiktionary
DISCOVERER OR INVENTOR
NAMED AFTER