armillary sphere

noun
ar·​mil·​la·​ry sphere | \ ˈär-mə-ˌler-ē- How to pronounce armillary sphere (audio) , är-ˈmi-lə-rē- How to pronounce armillary sphere (audio) \

Definition of armillary sphere

: an old astronomical instrument composed of rings showing the positions of important circles of the celestial sphere

First Known Use of armillary sphere

1625, in the meaning defined above

History and Etymology for armillary sphere

French sphère armillaire, from Medieval Latin armilla, from Latin, bracelet, iron ring, from armus shoulder — more at arm

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The first known use of armillary sphere was in 1625

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