orrery
A working model of the Solar System showing the planets, possibly with some
of their moons, in orbit around the Sun. It is 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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