There are different explanations regarding the Antikythera mechanism; some scholars consider it the first computer, others a chronometer or an instrument for celestial observations. Since its discovery by fishermen in the sea of Antikythera, the mechanism remains a scientific enigma. It was discovered almost two thousand years after it was made, in the hold of the ship that carried it.
Bronze was used for its creation, the oldest mechanism that exhibits gears. CAT scans of its inside have detected revolving discs with astronomical terms and … directions manual.