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 consists of a complex system of gears and dials that were used to predict astronomical positions and eclipses. This remarkable artifact demonstrates advanced engineering and astronomical knowledge for its time. Researchers have determined that it could calculate the cycles of the Moon, Sun, and even the five known planets, showcasing the sophistication of ancient Greek science and technology.