New Atomic Clock Standard for civilian use is three times more accurate than old clock used since 1999

The U.S. Department of Commerce’s National Institute of Standards and Technology (NIST) has officially launched a new atomic clock, called NIST-F2, to serve as a new U.S. civilian time and frequency standard, along with the current NIST-F1 standard.

NIST-F2 would neither gain nor lose one second in about 300 million years, making it about three times as accurate as NIST-F1, which has served as the standard since 1999. Both clocks use a “fountain” of cesium atoms to determine the exact length of a second.

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