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US scientists debut NIST-F4, atomic clock that stays true for 100 million years straight.

www.nist.gov

New Atomic Fountain Clock Joins Elite Group That Keeps the World on Time

  • NIST scientists have published results establishing a new atomic clock, NIST-F4, as one of the world’s most accurate timekeepers, priming the clock to be recognized as a primary frequency standard — the ultimate source of time.
  • The NIST-F4 clock was carefully and painstakingly assembled and tested over the last few years.
  • By joining a small group of elite clocks run by a handful of countries, NIST-F4 makes the foundation of global time more stable and secure.
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