NIST atomic fountain clock gets much better with time

The world's best clock, NIST-F1, has been improved over the past few years and now measures time and frequency more than twice as accurately as it did in 1999 when first used as a national standard, physicists at the National Institute of Standards and Technology report.

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<p><a href="http://www.physorg.com/news6732.html">NIST atomic fountain clock gets much better with time</a></p> <p>The world's best clock, NIST-F1, has been improved over the past few years and now measures time and frequency more than twice as accurately as it did in 1999 when first used as a national standard, physicists at the National Institute of Standards and Technology report.</p>