http://en.wikipedia.org/wiki/Antikythera_mechanism

The Antikythera mechanism (IPA: [ˌæntɪkɪˈθɪərə], an-ti-ki-theer-uh; Greek: IPA: [ˌɑndiˈkiθirɑ], ahn-dee-kee-thee-rah), is an ancient mechanical calculator (also described as the first known "mechanical computer"[1][2]) designed to calculate astronomical positions. It was discovered in the Antikythera wreck off the Greek island of Antikythera, between Kythera and Crete, in 1900. Subsequent investigation, particularly in 2006, dated it to about 150–100 BC, and hypothesised that it was on board a ship that sank en route from the Greek island of Rhodes to Rome. Technological artifacts of similar complexity did not reappear until a thousand years later.[3]

According to studies recently published in french renowed magazines "Nature" and "Science", recent findings indicate that the millenium aged mechanism actually utilized a very simple system closely related to quantum physics by calculating and evaluating the position of stars and moon cicles. It is still able to predict eclipses with an accuracy that left experts puzzled.

By using X-Ray screening, scientists were able to recreate the engine in 3d and decrypt the text. It contained each MODERN months, all containing more than 30 millimeter-sized sub-mechanism. Such a precise mechanism wasn't believed achieveable before the industrial era.

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http://afp.google.com/article/ALeqM5jBABAe_zqhOuSDQ_Ekx65ECThzpw
http://www.lepost.fr/article/2008/07/31/1233952_le-premier-ordinateur-etait-grec-et-olympique.html