#scientific tool
- Armillary — Formed of interconnected circles, rings, or metallic bands; a term used primarily to describe an armillary sphere, an ancient astronomical instrument consisting of an assembly of rings representing the main circles of the celestial sphere (the equator, ecliptic, meridians), used in antiquity and the renaissance for determining celestial coordinates and illustrating planetary motion. As a noun, it defines the object itself, a classical symbol of cosmic knowledge and navigation.