The Antikythera calculating mechanism The central ring consisted of

The central ring consisted of two semicircles

and operated manually

predecessor of the puzzle

as well as to determine important occurrences such as the Olympic Games

Then they were moving the pawns alternately until any of them achieves the formation of a straight line

The Antikythera calculating mechanism The central ring consisted ofThe first computational machine in history. It was built around 120 B. C. and was used to predict astronomical and calendar events, as well as to determine important occurrences such as the Olympic Games. It included at least 35 gears, dials, and discs, and operated manually. It accurately modeled complex cycles such as those of Meton, Callippus, Saros, and the Olympiad. Dimensions: 17 34 8 cm