Accuracy of the NPL caesium fountain clock further improved
Wednesday, February 19, 2014 - 11:02
in Biology & Nature
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.