The Antikythera mechanism ü÷Ãâ¡Ã±Ã½Ã¹ÃÆüÃÅÃâ ÃâÃâ°Ã½ ñýÃâùúÃâ¦Ã¸ÃÂÃÂÃâ°Ã½ is an ancient Greek analogue computer and orrery used to predict astronomical positions and eclipses for calendar and astrological purposes decades in advance. 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 knowledge of this technology was lost at some point in antiquity, and technological works approaching its complexity and workmanship did not appear again until the development of mechanical astronomical clocks in Europe in the fourteenth century. All known fragments of the Antikythera mechanism are kept at the National Archaeological Museum in Athens, along with a number of artistic reconstructions/replicas of how the mechanism may have looked and worked
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