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1 янв 1967 г. - Seconds - A Second is formally defined not trough movements of celestial bodies but as 9,192,631,770 vibrations of the cesium atom.
Добавлено на ленту времени:
Maths - History of time
By
Charlotte Best
21 ноя 2019
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0
462
Дата:
1 янв 1967 г.
Сейчас
~ 58 г назад
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