the Antikythera Mechanism. This was an ancient Greek computer, likely designed by Archimedes himself for predicting the movements of the heavenly bodies. Later refined and miniaturized over the centuries, fragments of a portable 1st century BCE version of the device were found in the Antikythera shipwreck at the dawn of the 20th century, but only properly understood much more recently thanks to advances in X-Ray and computer imaging.
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