Exploded computer reconstruction of the Antikythera Mechanism.
On the left, the front plate includes zodiac and calendar dials  and a conjectural reconstruction of the ancient Greek Cosmos . 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 , but the gearing behind the main plate for the lunar anomaly mechanism and the back dials is now firmly established , . On the upper right is the 19-year Metonic calendar dial , ,  and on the lower right, the 223-month Saros eclipse prediction dial .