The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.
The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.
On April 3, 2014, NIST hosted a news briefing on the NIST-F2 Atomic Clock.
<<Read the backgrounder on clock operation with an accompanying animation of NIST-F2.
Released April 3, 2014, Updated July 10, 2018