Time Service Department
U.S. Naval Observatory, Washington, DC

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The Official Source of Time Used in the United States

“The Department of the Navy serves as the country's official timekeeper, with the Master Clock facility at the Washington Naval Observatory.” —National Defense Authorization Act for Fiscal Years 1992 and 1993.

The U.S. Naval Observatory (USNO) is established as the Department of Defense reference for time by DoD Directive 5160.51 of 14 Jun 85 and SECNAV Instruction 4120.20 of 04 Feb 86.

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