SINCE 1828
armillary sphere
noun
ar·mil·la·ry sphere
| \ ˈär-mə-ˌler-ē-
, är-ˈmi-lə-rē-
\
, är-ˈmi-lə-rē-
\
Definition of armillary sphere
: an old astronomical instrument composed of rings showing the positions of important circles of the celestial sphere
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