Etymology
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orrery (n.)

a model solar-system machinery constructed to represent the motions of the planets in their orbits, 1713, invented c. 1704 by English clockmaker George Graham (1673-1751) and constructed by instrument maker John Rowley. Graham gave a copy to his patron, Charles Boyle (1674-1731), 4th Earl of Orrery (Cork) and named it in his honor.

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Definitions of orrery

orrery (n.)
planetarium consisting of an apparatus that illustrates the relative positions and motions of bodies in the solar system by rotation and revolution of balls moved by wheelwork; sometimes incorporated in a clock;
From wordnet.princeton.edu