Orrery
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High Quality Content by WIKIPEDIA articles! 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. They are typically driven by a large clockwork mechanism with a globe representing the Sun at the centre, and with a planet at the end of each of the arms. According to Cicero, the Greek philosopher Posidonius constructed an orrery, possibly similar or identical to the Antikythera mechanism, that exhibited the diurnal motions of the sun, moon, and the five known planets. Cicero's account was…mehr

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High Quality Content by WIKIPEDIA articles! 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. They are typically driven by a large clockwork mechanism with a globe representing the Sun at the centre, and with a planet at the end of each of the arms. According to Cicero, the Greek philosopher Posidonius constructed an orrery, possibly similar or identical to the Antikythera mechanism, that exhibited the diurnal motions of the sun, moon, and the five known planets. Cicero's account was written in the first century BC. The Antikythera mechanism may be considered one of the first orreries. It is an ancient mechanical calculator (also described as the first mechanical computer) designed to calculate astronomical positions. It was discovered in an ancient shipwreck off the Greek island of Antikythera, between Kythera and Crete, and has been dated to about 150-100 BC. Technological artifacts of similar complexity did not appear until a thousand years later.