出典:Wiktionary
出典:『Wiktionary』 (2026/01/26 00:56 UTC 版)
Named after Charles Boyle, 4th Earl of Orrery (1676–1731), for whom such a device was made. The placename is from Irish Orbhraighe, originally the name of a tribe (Orbh-raighe (“Orb's people”)), and then of a territory and a barony.
orrery (plural orreries)
出典:Wikipedia
出典:『Wikipedia』 (2011/07/19 16:14 UTC 版)
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.
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