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Ancient astronomy-based clock

The Antikythera mechanism was at first it was thought to be a corroded lump when found in a shipwreck off the coast of Greece, near Antikythera in 1900. The meshing bronze gears connected to a crank that move hands on the device’s face in accordance with the Metonic cycle, the 235-month pattern that ancient astronomers used to predict eclipses. Once scientists gained a full understanding as to how the pieces fitted together, it was soon learned that the Antikythera mechanism was capable of predicting the positions of the planets with which the Greeks were familiar—Mercury, Venus, Mars, Jupiter and Saturn—as well as the sun and moon, and eclipses. It even has a black and white stone that turns to show the phases of the moon.

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