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  1. Feb 2022
    1. It was not until the 14th century that scientists created the first sophisticated astronomical clocks.
    2. the first precision-geared mechanism known is a relatively simple—yet impressive for the time—geared sundial and calendar of Byzantine origin dating to about C.E. 600.

      The first known precision-geared mechanism is a sundial and calendar of Byzantine origin dating to circa 600 C.E.