Accuracy of the NPL caesium fountain clock further improved

In 2011, the NPL caesium fountain primary frequency standard (NPL-CsF2) was hailed as the most accurate long-term timekeeper in the world, as it would lose or gain only one second in 138 million years. Now, this level of accuracy has been increased further: to one second in 158 million years.

from Phys.org: Physics News http://ift.tt/1e7gDgT

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