Astrarium
Frederic P. Miller, Agnes F. Vandome, John McBrewster
High Quality Content by WIKIPEDIA articles! An astrarium, also called a planetarium, is the mechanical representation of the cyclic nature of astronomical objects in one timepiece. It is an astronomical clock. The first astraria were mechanical devices. Archimedes is said to have used a primitive version that could predict the positions of the sun, the moon, and the planets. On May 17, 1902 an archeologist named Valerios Stais discovered a lump of oxidated material with in it a mechanism with cogwheels in a shipwreck near Antikythera. This mechanism, known as the Antikythera mechanism, was recently redated between [150 to 100 B.C]. Extensive study of the fragments, using X-rays, have revealed enough details (gears, pinions, crank) to...
ISBN: 978-6-1341-7352-0
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Дата выхода: июль 2011