Relating to or resembling a ring, bracelet, or circular band; also describing a type of ancient astronomical instrument made of rings.
From Latin armillaris, derived from armilla. The term became especially associated with the armillary sphere, a sophisticated ancient astronomical model.
The armillary sphere was medieval astronomy's coolest gadget—nested metal rings showing how ancient astronomers thought the Earth sat at the center of rotating celestial spheres, like a cosmic onion!
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