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orrery





orrery
A working model of the Solar System showing the planets, possibly with some of their moons, in orbit around the Sun. Orreries are named after Charles Boyle, Fourth Earl of Cork and Orrery, who commissioned John Rowley in 1712 to make a copy of the first such device which had been invented in about 1710 by George Graham (1673–1751). The time scales of an orrery may be quite accurate, but size and distance proportions are of course wildly inaccurate.


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