The Antikythera Mechanism is an ancient Greek device discovered in 1901 in a shipwreck near the island of Antikythera. It is believed to date back to around 150-100 BCE and is considered the world's first analog computer. The mechanism was used to predict astronomical positions and eclipses for calendrical and astrological purposes. The device consists of a complex system of gears and dials, showcasing advanced engineering for its time. Researchers have determined that it could calculate the timing of the Olympic Games and other significant events, highlighting the sophistication of ancient Greek technology and understanding of astronomy.