Armillary Sphere Definition

ärmə-lĕrē, är-mĭlə-rē
noun
An old astronomical model with solid, usually metal rings, all great circles of a single sphere, used to display relationships among the principal celestial circles.
American Heritage
An ancient astronomical sighting instrument representing the great circles of the horizon, the ecliptic, the meridian, etc.
Webster's New World

An instrument consisting of graduated metal circles used to represent the motions of celestial bodies around the earth.

Wiktionary
Synonyms:

Origin of Armillary Sphere

  • Translation of French sphère armillaire from Latin armilla bracelet from armus shoulder ar- in Indo-European roots

    From American Heritage Dictionary of the English Language, 5th Edition

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