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15 juill. 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.
Ajouté au bande de temps:
History of Time
By
Hayah
21 nov. 2019
0
0
246
Date:
15 juill. 1967
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~ Il y a 56 ans
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