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Johann Reinhold, Celestial globe clock

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Johann Reinhold (1550-1596)
Celestial globe clock, Augsburg, 1588
Paris, Musée des Arts et Métiers, inv. 07491

This is one of the five extant examples of an astronomical instrument driven by a clockwork mechanism built by Johann Reinhold. It reproduces the movements of the heavenly bodies, and it allows the user to determine the hour and day of the year as well as performing numerous other calculations.