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jul 15, 1967 - A second is formally defined as 9,192,631,770 vibrations of the cesium atom. For the first time, time is not defined by the movement of astronomical bodies.
Added to timeline:
History of Time
By
Hayah
21 Nov 2019
0
0
243
Date:
jul 15, 1967
Now
~ 56 years ago
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