Researched
Sundial & Water Clock
Shadow clocks and water clocks divide the day into hours long before mechanical clocks exist.
Open in the interactive tree →Egyptian shadow clocks and water clocks are documented from about 1500 BC, and Greek and Chinese engineers added gears and floats. They made time measurable independent of the sun and prepared the mechanical clock.
Prerequisites
- Calendar3rd millennium BC
Unlocks
- Mechanical Clock~1300Water clocks and their gears and floats led to the mechanical clock
- Atomic Clock1955
Sources
More in Foundations of Civilization · Antiquity
- Writing~3200 BC
- Weights & Standard Measures~2500 BC
- Alphabet~1800 BC
- Libraries~650 BC
- Philosophy~585 BC
- Plato's Academy387 BC
- Calendar3rd millennium BC
- Paper~105 AD