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15 Jul 1967 Jahr - 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.
Zugefügt zum Band der Zeit:
History of Time
By
Hayah
21 Nov 2019
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0
246
Datum:
15 Jul 1967 Jahr
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~ 56 years ago
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