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orrery

[awr-uh-ree, or-] /ˈɔr ə ri, ˈɒr-/
noun, plural orreries.
1.
an apparatus for representing the positions, motions, and phases of the planets, satellites, etc., in the solar system.
2.
any of certain similar machines, as a planetarium.
Origin
1705-1715
1705-15; named after Charles Boyle, Earl of Orrery (1676-1731), for whom it was first made
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for orrery

orrery

/ˈɒrərɪ/
noun (pl) -ries
1.
a mechanical model of the solar system in which the planets can be moved at the correct relative velocities around the sun
Word Origin
C18: originally made for Charles Boyle, Earl of Orrery
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for orrery
n.

1713, invented c.1713 by George Graham and made by instrument maker J. Rowley, who gave a copy to his patron, Charles Boyle, 4th Earl of Orrery (Cork) and named it in his honor.

Online Etymology Dictionary, © 2010 Douglas Harper
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Encyclopedia Article for orrery

mechanical model of the solar system used to demonstrate the motions of the planets about the Sun, probably invented by George Graham (d. 1751) under the patronage of Charles Boyle, 4th Earl of Orrery. In use for several centuries, the device was formerly called a planetarium. The orrery presents the planets as viewed from outside the solar system in an accurate scale model of periods of revolution (with the Earth completing a year's rotation in about 10 minutes). The planets' sizes and distances, however, are necessarily inaccurate. See also planetarium.

Learn more about orrery with a free trial on Britannica.com
Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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