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The Antikythera mechanism (/ˌænt[invalid input: 'ɨ']k[invalid input: 'ɨ']ˈθɪərə/ ANT-i-ki-THEER or /ˌænt[invalid input: 'ɨ']ˈkɪθərə/ ANT-i-KITH-ə-rə) is an ancient mechanical computer designed to calculate astronomical positions. It was recovered in 1900–1901 from the Antikythera wreck. Its significance and complexity were not understood until decades later. Its time of construction is now estimated between 150 and 100 BC. Technological artifacts of similar complexity and workmanship did not reappear until the 14th century, when mechanical astronomical clocks were built in Europe.  This article incorporates text available under the CC BY-SA 3.0 license.