U.S.N.O. Master Clock Facility, Washington, DC

"Time is a great teacher, but unfortunately it kills all its pupils." -- Hector Berlioz

Precise Time & the USNO Master Clock

The US Naval Observatory Time Scale

International Time Scales and the BIPM

Definitions of Systems of Time at USNO

NAVSTAR GPS Timing Operations

Loran-C Timing Operations

OMEGA Timing Operations

Send comments on this page and those below it to Dr. Demetrios Matsakis, Director, Time Service Dept. Matsakis.Demetrios@usno.navy.mil

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