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US Naval Observatory outside display of the master clock time. The U.S. Naval Observatory provides public time service via 26 NTP [33] servers on the public Internet, [36] and via telephone voice announcements: [37] +1 202 762-1401 (Washington, DC) +1 202 762-1069 (Washington, DC) +1 719 567-6742 (Colorado Springs, CO)
NIST Automated Computer Time Service (ACTS) [27] +1-303-494-4774 +1-808-335-4721; Windows computer with dialup modem. ntpd with NIST/USNO/PTB Modem Time Services driver; ClockWatch Pro for Windows [22] USNO Master Clock modem time [28] +1-202-762-1594 Computer with Bell 212A or CCITT V.22 compatible modem US Naval Observatory time service UTC(USNO)
The other standard time and frequency reference for the U.S. Government is the National Institute of Standards and Technology (NIST) master clock. The U.S. Naval Observatory also maintains an alternate clock designated "USNO Alternate Master Clock" at Schriever Space Force Base, Colorado. [2]
Master clock (at left) driving several slave clocks in an enthusiast's garage. The third one from the left at the top is a radio-controlled clock for reference. 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]
Gernot Maria Rudolph Winkler (October 17, 1922 – April 30, 2016) was responsible for the Time Service Department of the United States Naval Observatory (USNO) from 1966 to 1996. [1] Winkler oversaw the introduction of caesium beam-based Coordinated Universal Time based on hyperfine transitions and an internationally transportable "flying clock".
Telegraph signals were used regularly for time coordination by the United States Naval Observatory starting in 1865. [10] By the late 1800s, many U.S. observatories were selling accurate time by offering a regional time signal service. [11] Sandford Fleming proposed a single 24-hour clock for the entire world.
A later version of Washington mean time based on the meridian of the clock room at the exact center of the New Naval Observatory (77°4′2.24″W or GMT − 5 h 8 m 16.15 s) was still being used in 1950 on a few pages of the American Ephemeris and Nautical Almanac, even though most of its pages used Greenwich Civil Time, the American name for ...
The Naval Oceanographic Office (NAVOCEANO), located at John C. Stennis Space Center in south Mississippi, is an echelon IV component of the Naval Meteorology and Oceanography Command (NMOC) and comprises approximately 1,000 civilian, military and contract personnel responsible for providing oceanographic products and services to all elements within the Department of Defense.