Bortle scale

Rarity: Uncommon

A topic a little better known than average, read and translated beyond its own country.

Rarity follows how well known the article is: its views on the French and English Wikipedia over a year, and the number of languages it exists in.

At a glance

Class

Notion

Domain

Science and technology

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What Wikipedia says

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.

Excerpt from the Wikipedia article “Bortle scale”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: ESO/P. Horálek, M. Wallner, CC BY 4.0, via Wikimedia Commons.