noun
a mechanical model of the solar system or of just the sun, earth, and moon, used to represent their relative positions and motions
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The orrery on display in the museum accurately depicts the movements of the planets in our solar system.
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I saw this cool orrery thing at the science museum that shows how the planets move around the sun.
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Check out that fancy orrery gadget showing how the planets orbit the sun!
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Her mind was like a complex orrery, each thought moving in precise orbits around a central idea.