What is the first computer recognized in human history?

Context: The Antikythera mechanism is an Ancient Greek hand-powered orrery, described as 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 which was similar to an Olympiad, the cycle of the ancient Olympic Games.

Answer: The Antikythera mechanism, an astronomical clock, was built around 100 BC and is considered the world's first computer.