Hypertext Webster Gateway: "Orrery"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Orrery \Or"re*ry\, 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.
From WordNet (r) 1.7 (wn)
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
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