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Timekeeping Timeline

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c. 1600 BCE

Earliest Egyptian water clocks in use.
c. 450 BCE

Parapegma star calendar invented in Greece by Meton and Euctemon.
c. 450 BCE

First klepsydra - water timekeeping device - used in Athens.
c. 275 BCE

Ctesibius invents first sophisticated multi-cogged water-clock.
c. 159 BCE

First water-clock set up in Rome.
c. 110 BCE - c. 50 BCE

Tower of The Winds by Andronicus constructed in Athens.
c. 50 BCE

Antikythera instrument invented, an astronomical measuring device.

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