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1 janv. 1967 - Seconds - A Second is formally defined not trough movements of celestial bodies but as 9,192,631,770 vibrations of the cesium atom.
Ajouté au bande de temps:
Maths - History of time
By
Charlotte Best
21 nov. 2019
0
0
295
Date:
1 janv. 1967
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~ Il y a 57 ans
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