Formerly The Directorate of Time

The Time Service Dept., U.S. Naval Observatory is the official source of time used in the United States.


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What time is it?

Telephone time (202) 762-1401 and 762-1069

The USNO Master Clock

GPS Satellite Timing Operations

Automated Data Service

USNO Computer Time Services

World Time Zones

Times of Sun/Moon Rise/Set/Phases

History of USNO Timekeeping.

Two-way Satellite Time Transfer

Precise Time and Time Interval (PTTI) Meeting

Frequently Asked Questions

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The Time Service Dept. is located at the U.S. Naval Observatory, Washington, DC.
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"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 is established as the Department of Defense reference for time by DoD Instruction 5000.2, SECNAV Instruction 5000.2D, and OPNAV Instruction 5000.2


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The information in this WWW service is subject to change or termination without notice.

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A serious note...

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"The inaudible and noiseless foot of Time." --W. S.