While it might seem like an unbelievable thing, it’s true that the first analogue computer was built around or before 100 BC. The Antikythera Mechanism is an ancient analogue computer used to predict astronomical positions and eclipses for calendars and astrology. Discovered in July 1901 in the shipwreck off the Greek island of Antikythera, the mechanism is believed to have been designed and constructed by Greek scientists between 200 BC and 100 BC.