![]() The largest gear is approximately 13 centimetres (5.1 in) in diameter and originally had 223 teeth. Four of these fragments contain gears, while inscriptions are found on many others. ![]() The device, housed in the remains of a wooden-framed case of (uncertain) overall size 34 cm × 18 cm × 9 cm (13.4 in × 7.1 in × 3.5 in), was found as one lump, later separated into three main fragments which are now divided into 82 separate fragments after conservation efforts. On, it was identified as containing a gear by archaeologist Valerios Stais. This artefact was among wreckage retrieved from a shipwreck off the coast of the Greek island Antikythera in 1901. It could also be used to track the four-year cycle of athletic games which was similar to an Olympiad, the cycle of the ancient Olympic Games. The Antikythera mechanism ( / ˌ æ n t ɪ k ɪ ˈ θ ɪər ə/ AN-tih-kih- THEER-ə) is an Ancient Greek hand-powered orrery, described as the oldest example of an analogue computer used to predict astronomical positions and eclipses decades in advance. The Antikythera mechanism (fragment A – front and rear) visible is the largest gear in the mechanism, approximately 13 centimetres (5.1 in) in diameter.
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