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Recovered from a Roman-era shipwreck off the Greek island of Antikythera in 1900, the Antikythera mechanism is a corroded lump of bronze that has astonished historians. Modern X-ray scans reveal that it once held around thirty interlocking gears, arranged with a precision unmatched for more than a thousand years afterward. By turning a handle, an ancient user could track the positions of the Sun and Moon, predict eclipses, and even mark the timing of athletic festivals. Often described as the first analogue computer, it shows that Greek engineers had translated their theories of the heavens into working machinery.