Armillary sphere in antique brass, an armillary sphere is an astronomical instrument. It is used to represent the movement of celestial bodies.
An armillary sphere is composed of several metal rings that rotate around each other and together form the shape of a sphere. This structure is usually mounted on a frame.
The armillary sphere was used in Greece in the 2nd century BC and in China in the 1st century. The name comes from the Latin armilla (ball), as the instrument is mounted on a skeleton of graduated circles and shows the equator, the ecliptic and the astronomical meridian and parallel.