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1600 BCE
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200 BCE
100 BCE
1600 BCE: Earliest Egyptian water clocks in use.
450 BCE: Parapegma star calendar invented in Greece by Meton and Euctemon.
450 BCE: First klepsydra - water timekeeping device - used in Athens.
275 BCE: Ctesibius invents first sophisticated multi-cogged water-clock.
159 BCE: First water-clock set up in Rome.
110 BCE - 50 BCE: Tower of The Winds by Andronicus constructed in Athens.
50 BCE: Antikythera instrument invented, an astronomical measuring device.