Christián C. Carman, a science historian at the National University of Quilmes in Argentina, and James Evans, a physicist at the University of Puget Sound in Washington, suggest that the calendar of the mysterious device began in 205 B.C., just seven years after Archimedes died.
The mechanism was most likely housed in a wooden box and operated by a hand crank. The device itself bears inscriptions on the front and back. In the 1970s, the engravings were estimated to date from 87 B.C. But more recently, scientists examining the forms of the Greek letters in the inscriptions dated the mechanism to 150 to 100 B.C.
Writing this month in the journal Archive for History of Exact Sciences, Dr. Carman and Dr. Evans took a different tack. Starting with the ways the device's eclipse patterns fit Babylonian eclipse records, the two scientists used a process of elimination to reach a conclusion that the "epoch date," or starting point, of the Antikythera Mechanism's calendar was 50 years to a century earlier than had been generally believed.
The finding supports the idea, scientists said, that the mechanism's eclipse prediction strategy was not based on Greek trigonometry, which did not exist at the time, but on Babylonian arithmetical methods borrowed by the Greeks. [emphasis added]