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15 jul 1967 ano - 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.
Adicionado na linha do tempo:
History of Time
By
Hayah
21 nov 2019
0
0
246
Data:
15 jul 1967 ano
Agora
~ 56 years ago
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