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ABOUT US
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Naval Oceanography One Pager
End of Year Graphic 2022
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The USNO Master Clock
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International Time Scales and the BIPM
Definitions of Systems of Time
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Global Positioning System Overview
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CGGTTS Data Format
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Leap Seconds
GPS Information: SA, DGPS, Leap Seconds, etc.
GPS Week Number Rollover
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USNO Format Explanation
USNO Computer Display Clocks
Two-Way Satellite Time Transfer (TWSTT)
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United States Naval Observatory
The James M. Gilliss Library
Historical Photographs, Artwork, and Objects
Home
Our Commands
United States Naval Observatory
The James M. Gilliss Library
Historical Photographs, Artwork, and Objects
ABOUT US
Mission & Vision
History
Naval Oceanography One Pager
End of Year Graphic 2022
LEADERSHIP
Commander
Technical Director
Command Master Chief
All Leadership
OUR COMMANDS
Naval Oceanographic Office
Fleet Numerical Meteorology & Oceanography Center
United States Naval Observatory
News from the Naval Observatory
Earth Orientation Department
Precise Time Department
The USNO Master Clock
The USNO Master Clock
Time Dissemination at the USNO
USNO Alternate Master Clock (AMC)
Cesium Atomic Clocks
Hydrogen Masers at the USNO
Rubidium Fountain Clocks
USNO Time Scales
International Time Scales and the BIPM
Definitions of Systems of Time
Global Positioning System
Global Positioning System Overview
USNO GPS Data Categories Explanation
CGGTTS Data Format
USNO GPS Time Transfer
Leap Seconds
GPS Information: SA, DGPS, Leap Seconds, etc.
GPS Week Number Rollover
GPS Timing Data and Information
USNO Format Explanation
USNO Computer Display Clocks
Two-Way Satellite Time Transfer (TWSTT)
Telephone Time
Network Time Protocol (NTP)
US Eastern Time Zone NTP Servers
US Mountain Time Zone Servers
DoD Customer Servers
Astronomical Applications Department
Celestial Reference Frame Department
Senior Enlisted Advisor
Careers at the USNO
Naval Oceanography Operations Command
Fleet Weather Center - Norfolk
National Ice Center
Fleet Weather Center - San Diego
Joint Typhoon Warning Center
Naval Oceanography Anti-Submarine Warfare Center
Navy DoD Supercomputing Resource Center
PRESS ROOM
News Stories
Photo Gallery
Video Gallery
Public Use of Limitations
CONTACT US
Historical Photos, Artwork, and Objects
The James M. Gilliss Library contains numerous artifacts of historical significance. Here you can sample of some of the library's holdings.
Historical Images Search
Hundreds of old USNO photos have been scanned showing vintage telescopes and astronomers at work.
Historical Collection
We have portraits of USNO astronomers, a celestial globe, old clocks and an orrery along with a vast collection of rare astronomy texts.
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