Primum Mobile

Rarity: Common

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Notion

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Beliefs and thought

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What Wikipedia says

In classical, medieval, and Renaissance astronomy, the Primum Mobile (Latin: "first movable") was the outermost moving sphere in the geocentric model of the universe.

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

Image: Master of the E-Series Tarocchi, CC0, via Wikimedia Commons.