Definitions for "Armillary sphere"
An instrument consisting of an arrangement of rings, all of which are circles of the same sphere, used to show the relative positions of the celestial equator, ecliptic, and other circles of the clestial sphere. See Medici article.
a celestial globe consisting of metal hoops; used by early astronomers to determine the positions of stars
a globe that
Keywords:  heavens, model
a model of the heavens