Armillary 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.

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Notion

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Science and technology

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What Wikipedia says

An armillary sphere (variations are known as spherical astrolabe, armilla, or armil) is a model of objects in the sky (on the celestial sphere), consisting of a spherical framework of rings, centered on Earth or the Sun, that represent lines of celestial coordinate system and other astronomically important features, such as the ecliptic.

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

Image: Alain Manesson Mallet, Paris, Public domain, via Wikimedia Commons.