411 REFERENCE · Wiktionary
Bortle scale
Reference material by Wiktionary contributors. This retains its source identity and is not 411 news reporting.
English
Etymology
Named after John E. Bortle, who created the scale.
Proper noun
1
en astronomy A nine-level numeric scale that measures the night sky's brightness of a particular location.
Anagrams
en abceellorst brocatelles
en eponyms