The atomic clock with the world's best long-term accuracy is revealed after evlauation

A caesium fountain clock that keeps the United Kingdom's atomic time is now the most accurate long-term timekeeper in the world, according to a new evaluation of the clock that will be published in the October 2011 issue of the international scientific journal Metrologia by a team of physicists at the National Physical Laboratory (NPL) in the United Kingdom and Penn State University in the United States. An early posting of the paper on the journal's online site will occur on 26 August 2011.

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