Antikythera mechanism

Antikythera mechanism The Antikythera mechanism is an ancient Greek analog computer 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 construction - bronze alloy and gears - as well as the tolerances of construction was well within the tech of greece at the time.

This was the official and misleading explanation of the 21st century

See : The Antikythera Case - Axiom Case 887