such as astrolabes and water clocks, that were used in astronomy. As for the cities that experienced eclipses and built early public mechanical clocks, most had standout population growth in the ...

Sundials and shadow clocks were being used as early as 3,500 years ago ... but another kind of clock! Clepsydras, or water clocks, tracked the passage of time by regulating the flow of water ...

One early way to measure time was the clepsydra ... It was named after the Greek water clock because, prior to a 1959 earthquake, it erupted every three minutes. This kind of clock has been ...