Definition of armillary sphere
: an old astronomical instrument composed of rings showing the positions of important circles of the celestial sphere
Origin of armillary sphere
French sphère armillaire, from Medieval Latin armilla, from Latin, bracelet, iron ring, from armus shoulder — more at arm
First Known Use: 1664
Learn More about armillary sphere
Britannica.com: Encyclopedia article about "armillary sphere"
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