Department of Defense master clock

The Department of Defense master clock is the atomic master clock to which time and frequency measurements for the United States Department of Defense are referenced.

The master atomic clock ensemble at the U.S. Naval Observatory in Washington D.C., which provides the time standard for the U.S. Department of Defense.[1] The rack mounted units in the background are caesium beam clocks. The black units in the foreground are hydrogen maser standards.

Located in Washington D.C., the U.S. Naval Observatory master clock is designated as the "DOD Master Clock". It is one of the two standard time and frequency references for the U.S. Government in accordance with Federal Standard 1002-A. The other standard time and frequency reference for the U.S. Government is the National Institute of Standards and Technology (NIST) master clock.

In 2018, it was proposed to replace the existing Clock House building it's housed in, designed by Richard Morris Hunt, with a new facility.[2]

The U.S. Naval Observatory also maintains an alternate clock designated "USNO Alternate Master Clock" at Schriever Air Force Base, Colorado.[3]

 This article incorporates public domain material from the General Services Administration document: "Federal Standard 1037C". (in support of MIL-STD-188)

References
  1. USNO Master Clock
  2. Neibauer, Michael (2018-06-26). "Time has run out on the Naval Observatory's Clock House. Here's the $101M plan to build a new one". Washington Business Journal. Retrieved 2019-06-09.
  3. "US Naval Alternate Master Clock". Navy.mil. 6 September 2019. Archived from the original on 14 September 2018. Retrieved 6 September 2019.
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