noun, plural or·rer·ies.
- an apparatus for representing the positions, motions, and phases of the planets, satellites, etc., in the solar system.
- any of certain similar machines, as a planetarium.
noun plural -ries
- a mechanical model of the solar system in which the planets can be moved at the correct relative velocities around the sun
n.1713, invented c.1713 by George Graham and made by instrument maker J. Rowley, who gave a copy to his patron, Charles Boyle, 4th Earl of Orrery (Cork) and named it in his honor.