The Ancient Greek Water Clock That Kept the Most Accurate Time for 1,800 Years

In the third century BC, Greek inventor Ctesibius created an automatic water clock that maintained more accurate timekeeping than any other device for 1,800 years until the invention of the pendulum clock in 1656. His ingenious design used a vertical cylinder filled through a feeding reservoir with a floating pointer that indicated the hour, combined with a water wheel and gear system to keep the mechanism functioning automatically without human intervention. This ancient innovation established the foundational principles of automation and timekeeping that influenced technological development for centuries.