armillary sphere
Historical astronomical instrument consisting of a model of the celestial sphere with rings representing the equator, ecliptic, etc. Used in East Asian astronomy.
See also: 天球儀
The armillary sphere was used in ancient China to measure the positions of celestial bodies.
Borrowed from Chinese 渾天儀, the name of an instrument representing the heavens according to the traditional 渾天 cosmological model.