lunartime.org

Organization

United States Naval Observatory

United States timekeeping observatory; it maintains UTC(USNO), one of the two national realizations of UTC named in the 2024 lunar time policy.

At a glance

Every value in this table comes from the entry in our organizations registry; the links below lead to the pages it connects to.
FieldValue
Short nameUSNO
TypeNational institute
BasedUnited States
Address we linkwww.cnmoc.usff.navy.mil
TrackerNo track of its own
Documents on this site1 document
Papers on this siteNone yet
Facts on this page4, each with its own source

Key facts

  • Traceability to Coordinated Universal Time is the first of the four features the 2024 memorandum requires of every new celestial time standard. [1]Official
  • The footnote attached to that requirement names UTC(USNO) and UTC(NIST) as the local approximations of UTC maintained by the United States. [1]Official
  • The same footnote states that Department of Defense systems continue to operate in accordance with DOD CJCSI 6130.01H and may interoperate with other systems as required. [1]Official
  • The observatory publishes at a United States Navy address, checked in a browser on 24 August 2026. [2]

In short

The observatory appears in the lunar time file at exactly one point, and it is a load-bearing one. The first feature the 2024 policy memorandum requires of any new celestial time standard is traceability to Coordinated Universal Time, and the footnote attached to that requirement names the two United States realizations of UTC: UTC(USNO) and UTC(NIST). No document in our registry gives the observatory a role in defining the lunar scale itself.

Every clock value on this site is a model value computed from published rate figures: no lunar time scale has been realized, and nothing on this page is a reading taken from a clock on the Moon[3]Official. The record itself sits inthe list of organizations, and the wider background is inwhat Coordinated Lunar Time is.

What it decides

  1. Nothing about the lunar scale itself, in any document we hold: it appears as one end of the traceability chain.
  2. How United States military and civil systems keep a common realization of UTC that a lunar scale would refer back to.

Where this record connects

Documents

Other organizations

Sources

  1. Policy on Celestial Time Standardization — White House Office of Science and Technology Policy, . Official document. Verified .
  2. U.S. Naval Observatory — United States Naval Observatory (Commander, Naval Meteorology and Oceanography Command), . Reference. Verified .
  3. Resolution on the establishment of a coordinated lunar time standard by international agreement — International Astronomical Union, Commission A3 — XXXII General Assembly, . Official document. Verified .

Last verified