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The delicate workings at the heart of a 2,000-year-old analogue computer have been revealed by scientists.
The Antikythera Mechanism, discovered more than 100 years ago in a Roman shipwreck, was used by ancient Greeks to display astronomical cycles.
Using advanced imaging techniques, an Anglo-Greek team probed the remaining fragments of the complex geared device.
The results, published in the journal Nature, show it could have been used to predict solar and lunar eclipses.
The 2,000-year-old computer
Cardiff experts have led an international team in unravelling the secrets of a 2,000-year-old computer which could transform the way we think about the ancient world.
Professor Mike Edmunds of the School of Physics and Astronomy (pictured left) and mathematician Dr Tony Freeth first heard of the Antikythera Mechanism, a clock-like astronomical calculator dating from the second century BC, several years ago. Now they believe they have cracked the centuries-old mystery of how it actually works.
Remnants of a broken wooden and bronze case containing more than 30 gears was found by divers exploring a shipwreck off the island of Antikythera at the turn of the 20th century. Scientists have been trying to reconstruct it ever since. The new research suggests it is more sophisticated than anyone previously thought.
Detailed work on the gears in the mechanism showed it was able to track astronomical movements with remarkable precision. The calculator was able to follow the movements of the moon and the sun through the Zodiac, predict eclipses and even recreate the irregular orbit of the moon. The team believe it may also have predicted the positions of the planets.