armillary sphere
noun
- a model of the celestial globe constructed from rings and hoops representing the equator, the tropics, and other celestial circles, and able to revolve on its axis浑天仪。
词源
mid 17th cent.: from modern Latin armillaris 'relating to an armilla'， an astronomical instrument consisting of a hoop fixed in the plane of the equator (sometimes crossed by one in the plane of the meridian)， used by the ancient astronomers to show the recurrence of equinoxes and solstices; from Latin armilla 'bracelet'.