Sundial (742 B.C.)
742 B.C.
% complete
Hourglass (1338)
1338
% complete
Watch (1504)
1504
% complete
Pendulum Clock (1656)
1656
% complete
Wall Clock (1753)
1753
% complete
Atomic Clock (1949)
1949
% complete
Digital Clock (1968)
1968
% complete
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