(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
The Collaborative International Dictionary of English (GCIDE) v.0.53
n.; pl.Orreries [ So named in honor of the Earl of Orrery. ] An apparatus which illustrates, by the revolution of balls moved by wheelwork, the relative size, periodic motions, positions, orbits, etc., of bodies in the solar system. [ 1913 Webster ]
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