The Breitling Navitimer.

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History at your fingertips Second, fundamental unit of time, now defined in terms of the radiation frequency at which atoms of the element cesium change from one state to another. Categories 

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Omega, the Olympics, and the innovations required to time the Earth’s BestOfficial Timekeeper is o When the increasing accuracy of clocks led to the adoption of the mean solar day, which contained 86,400 seconds, this mean solar second became the basic unit of time. …



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The adoption of the SI second, defined on the basis…




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Be on the lookout for your Britannica newsletter to get trusted stories delivered right to your inbox. The icon of the Breitling lineup, and without a doubt one of my favorites.

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Search Britannica The second was formerly defined as 1/86,400 of the mean solar day—i.e., the average period of rotation of the Earth on its axis relative to the

But three months and another positive test later, she told CNN she is still feeling unwell. Until 2018, watch fans have grown accustomed to having two major showings of brand-new watch The second is defined as the duration of 9,192,631,770 cycles of the radiation associated with a specified transition, or change in energy level, of the cesium-133 atom.…