A working model of the Solar System which represents mechanically the movements of the planets. The name is from the fourth Earl of Cork and Orrery, Charles Boyle (1676–1731), for whom one of the first was made. Popular in the eighteenth century, they ranged from ‘grand orreries’ a metre in diameter which re-created the rotational and orbital motions of planets and satellites, down to small portable devices featuring just the Earth, Moon, and Sun. An orrery of the latter type is also known as a tellurium or tellurian.