Antikythera mechanism

Ancient analogue astronomical computer

The Antikythera mechanism is an Ancient Greek hand-powered orrery. It is the oldest known example of an analogue computer used to predict astronomical positions and eclipses decades in advance. It could also be used to track the four-year cycle of athletic games similar to an Olympiad, the cycle of the ancient Olympic Games.

This keyword could refer to multiple things. Here are some suggestions: