Ancient Greek water clock accurately measured time for centuries
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In ancient Greece, Ctesibius created a water clock in the third century BC that provided the most accurate timekeeping for 1,800 years.
Earlier water clocks, used as far back as the sixteenth century BC in places like Iraq, Iran, and Egypt, relied on a simple dripping bowl, but weren’t consistent. Ctesibius improved the design by using a vertical cylinder marked with hours and months, moved by water level and a system of gears.
This clock featured a reservoir that supplied water at a steady rate and a siphon that emptied it daily to reset the mechanism. The design compensated for the varying length of daylight hours in the ancient Greek system of timekeeping. The clepsydra remained the most precise timekeeping device until 1656, when Christiaan Huygens invented the pendulum clock.
Though later inventions like hourglasses came between Ctesibius’ work and Huygens’, the water clock’s design established principles of automation and time measurement still relevant today.
