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A small orrery showing earth and the inner planets

An orrery is a mechanical model of the Solar System. It shows the relative positions and motions of the planets and moons. It is usually a heliocentric model.

The Greeks had working planetaria. The first orrery that was a planetarium of the modern era was produced in 1704. One was presented to Charles Boyle, 4th Earl of Orrery – hence the name. They are usually driven by a clockwork mechanism. The globe in the centre represents the Sun, and a planet is at the end of each arm. view more...

Tons of planets can support life. Kepler Orrery IV

Tons of planets can support life. Kepler Orrery IV
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