The Antikythera mechanism is an Ancient Greek hand-powered orrery, described as the oldest known example of an analogue computer used to predict astronomical positions and eclipses decades in advance. It could also be used to track the four-year cycle of athletic games similar to an Olympiad, the cycle of the ancient Olympic Games.
The Antikythera mechanism (fragment A – front and rear); visible is the largest gear in the mechanism, about 13 cm (5 in) in diameter.
Image: NAMA Machine d'Anticythère 4
Derek J. de Solla Price (1922–1983) with a model of the Antikythera mechanism
Computer-generated front panel of the Freeth model
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TR-10 desktop analog computer of the late 1960s and early 1970s
Analog computing machine at the Lewis Flight Propulsion Laboratory c. 1949.