Sundial 3500 BC
3500 BC
% complete
Water Clocks 1400 BC
1400 BC
% complete
Candle Clock 520 CE
520 CE
% complete
Mechanical Clock 1275 CE
1275 CE
% complete
Hourglass 1300 CE
1300 CE
% complete
Pendulum Clock 1656 CE
1656 CE
% complete
Wrist Watch 1868 CE
1868 CE
% complete
Atomic Clock 1949 CE
1949 CE
% complete
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