An Ancient Greek bronze hand-powered mechanical device that calculated astronomical positions, is described as the oldest known example of an analogue computer.
In 1900, off the coast of Antikythera, a Greek island on the edge of the Aegean Sea, Greek sponge divers found a Roman-era shipwreck where the Antikythera Mechanism was later found. The shipwreck dates to circa 65 B.C. and the sophisticated mechanism, which has intricate gears and dials, in addition to written inscriptions, could track the cycles of the Solar System.
The Antikythera Mechanism Project