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Orrery

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Dictionaries
Webster Dictionary
• Orrery
• Orreries
Encyclopedias
1911 Encyclopedia Britannica
• Charles Boyle, 4th Earl of Orrery
• Mary, Countess of Cork and Orrery
• Roger Boyle, 1st Earl of Orrery
The Nuttall Encyclopedia
• Orrery

(n.) 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.