Orrery

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A small orrery showing earth and the inner planets

An orrery is a mechanical device that illustrates the relative positions and motions of the planets and moons in the Solar System in a heliocentric model. Though the Greeks had working planetaria, the first orrery that was a planetarium of the modern era was produced in 1704, and one was presented to the Earl of Orrery — whence the name came. They are typically driven by a clockwork mechanism with a globe representing the Sun at the centre, and with a planet at the end of each of the arms.

• See also: Wikipedia, Commons

• Related: Apparent retrograde motion, Astrarium, Astrolabe, Astronomical clock, Ephemeris, Eratosthenes, Orbit of the Moon, Stability of the Solar System, Tellurion, Torquetum

JPL Solar System Simulator JPL Solar System Simulator space.jpl.nasa.gov - Web

Armagh Observatory Human Orrery Armagh Observatory Human Orrery star.arm.ac.uk/orrery/ - Web

Long Now Foundation Orrery Long Now Foundation Orrery www.longnow.org/projects/clock/orrery/ - Web

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University of Pennsylvania Orrery University of Pennsylvania Orrery www.library.upenn.edu/exhibits/pennhistory/orrery/orrery.html - Web

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