The Antikythera Mechansim is a device that was built more than 2000 years ago and which was discovered on a wrecked ship in 1901 and which has now been proven to calculate the positions of the Sun, the Moon, Mars, Venus, and the other planets known to the Ancient Greeks. In addition, it can be used to determine solor and lunar eclipses, compensates for leap years and tracks the dates of the Olympic Games. A British curator called Michael Wright has spent a fair while re-creating a fully working version of the mechanism.
Apparently, nothing as complex as this has been discovered originating until at least 1000 years after this was created. It makes you wonder if aliens (Dr Who?) inadvertently left something behind on one of their visits...

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