Word.ws English Dictionary

Bortle scale

Bortle scale proper noun: a nine-level numeric scale that measures the night sky's brightness of a particular location.

Proper noun

the Bortle scale

  1. A nine-level numeric scale that measures the night sky's brightness of a particular location.

Origin of Bortle scale

Named after John E. Bortle, who created the scale.

Questions about Bortle scale

What does Bortle scale mean?
Bortle scale means a nine-level numeric scale that measures the night sky's brightness of a particular location.
What part of speech is Bortle scale?
Bortle scale is a proper noun.

Words near Bortle scale in the dictionary

  1. Borth-y-Gest
  2. Borths
  3. Borthwick
  4. Borthwicks
  5. Bortle
  6. Bortle scale
  7. Bortles
  8. Bortleses
  9. Bortner
  10. Bortners
  11. Borton

Source and license

Adapted from Wiktionary: Bortle scale (page history and authors). Text available under the Creative Commons Attribution-ShareAlike 4.0 license. Word.ws reformatted the entry and added links. Wiktionary data of 2026-09-02.

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Cite this entry: “Bortle scale.” Word.ws, https://word.ws/bortle_scale. Based on Wiktionary, CC BY-SA 4.0.