Exploded computer reconstruction of the Antikythera Mechanism.

On the left, the front plate includes zodiac and calendar dials [6] and a conjectural reconstruction of the ancient Greek Cosmos [5]. In the middle is an exploded reconstruction of the gears. The input contrate gear is in the centre, with a keyway to turn the Mechanism. The planetary gearing at the front is conjectural [5], but the gearing behind the main plate for the lunar anomaly mechanism and the back dials is now firmly established [1], [6]. On the upper right is the 19-year Metonic calendar dial [1], [4], [7] and on the lower right, the 223-month Saros eclipse prediction dial [1].