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400
Water Clock 400 B.C.
The Greeks use a water clock, which measures the outflow of water from a vessel, in order to measure time -
Jan 1, 1500
Sundial 1500-1300 B.C.
Sundial first used in Egypt to measure the time of day by the sun's shadow.The clock showed that hours are shorter in winter and longer in summer. -
The Pendulum 1583
Galileo Galilei realizes that the frequency of a pendulum's swing depends on its length. This was when the pendulum was improved.