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An armillary sphere is a model of the sky made from several rings, joined around a small globe. The rings show important lines used to describe the positions and paths of the sun, moon, stars, and planets. It looks like a metal cage surrounding Earth.
Armillary spheres were used by astronomers and teachers to study and explain the sky before modern telescopes. The word comes from a Latin word meaning "ring" or "bracelet". Some spheres are placed with Earth at the center, while others show the Sun at the center.
Armillary spheres were used by astronomers and teachers to study and explain the sky before modern telescopes. The word comes from a Latin word meaning "ring" or "bracelet". Some spheres are placed with Earth at the center, while others show the Sun at the center.