Ctesibius' Water Clock: Ancient Greek Timekeeping Precision for 1,800 Years
An animated video from the Deconstructed series explains the ancient Greek water clock, or clepsydra, invented by Ctesibius in the third century BC. The device, which used a vertical cylinder rotating yearly and a floating pointer, kept time more accurately than any other mechanism for 1,800 years, until Christiaan Huygens introduced the pendulum clock in 1656. The clepsydra's origins trace back to the sixteenth century BC, with early examples found in modern-day Iraq, Iran, and Egypt. Ctesibius improved upon these by incorporating a siphon to reset the daily cycle and a water wheel with gears to adjust for varying daylight hours. The video highlights the invention's role in laying the foundation for automation and timekeeping. The article also references related content on historical timekeeping devices, including the Antikythera mechanism and medieval Islamic engineering.
Key facts
- Ctesibius invented an automatic water clock in the third century BC.
- The clepsydra kept better time than any other device for 1,800 years.
- Christiaan Huygens invented the pendulum clock in 1656, surpassing the water clock.
- Early water clocks date back to the sixteenth century BC.
- Evidence of early water clocks found in Iraq, Iran, and Egypt.
- Ctesibius' clock used a vertical cylinder and a floating pointer.
- A siphon reset the clock's daily cycle every 24 hours.
- The video is from the Deconstructed series on YouTube.
Entities
Artists
- Ctesibius
- Christiaan Huygens
Institutions
- Open Culture
Locations
- Iraq
- Iran
- Egypt
- India
- China
- Seoul