Celestial sphere

Rarity: Rare

A topic known well beyond its field, found in many languages.

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

In astronomy and navigation, the celestial sphere is an abstract sphere that has an arbitrarily large radius and is concentric to Earth. All objects in the sky can be conceived as being projected upon the inner surface of the celestial sphere, which may be centered on Earth or the observer.

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

Image: ChristianReady, CC BY-SA 4.0, via Wikimedia Commons.