Armillary sphere in the garden of Dey Mansion in Wayne, New Jersey. The armillary sphere is an old astronomical instrument It is composed of rings (known in Latin as armillae) showing the positions of important circles of the celestial sphere. The circles represent the horizon, the celestial equator, the colures and the ecliptic. It models the celestial sphere with respect to the horizon of an observer. These armillary spheres were usually highly decorated. The sphere in the Dey Mansion Garden uses an arrow to point north and a sailing ship to represent the observers position. More info...