The Antikythera mechanism is an ancient Greek analog computer and orrery used to predict astronomical positions and eclipses for calendar and astrological purposes decades in advance. It could also track the four-year cycle of athletic games which was similar to an Olympiad, the cycle of the ancient Olympic Games. The device was found housed in the remains of a 340-millimetre (13 in) × 180-millimetre (7.1 in) × 90-millimetre (3.5 in) wooden box. It is a complex clockwork mechanism composed of at least 30 meshing bronze gears. A team led by Mike Edmunds and Tony Freeth at Cardiff University used modern computer x-ray tomography and high resolution surface scanning to image inside fragments of the crust-encased mechanism and read the faintest inscriptions that once covered the outer casing of the machine
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