Antikythera mechanism

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The Antikythera mechanism is an incredibly old mechanical calculator. It is also described as the first mechanical computer. It was discovered in 1901 in a shipwreck off the coast of Antikythera, Greece. The device was used to figure out the positions of stars in the sky. It was probably made in about 150-100 BC, and is now on display in the Bronze Collection of the National Archaeological Museum of Athens.