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Earth Orientation Department
USNO Earth Orientation Products
Contents of Bulletin A
USNO GPS Products
GPS User Information
USNO VLBI-based Products
VLBI Correlator Data
VLBI-based Earth Orientation Parameters (EOP)
Earth Orientation Information Center
General Information about Earth Orientation
Frequently Asked Questions About Earth Orientation
What Is Earth Orientation?
What Is Polar Motion?
What does the Earth rotation coordinate measure?
What is the Celestial Pole Offset?
What is a Leap Second?
How do we measure Earth Orientation?
What causes variations in the Earth's orientation?
Who uses Earth orientation information?
Publications About Earth Orientation Products
Earth Orientation Software
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
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)
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
Naval Oceanography Operations Command
Fleet Weather Center - Norfolk
Fleet Weather Center - San Diego
Joint Typhoon Warning Center
Public Use of Limitations
Naval Meteorology and Oceanography Command
Commander Casey J. Gon
Director, U.S. National Ice Center & Commanding Officer, Naval Ice Center
13 June 2022
Commander Gon, a native of Buffalo, New York, graduated from the Naval Academy, earning a Bachelor of Science in Economics in 2003.
After receiving a commission from the USNA, CDR Gon served as the Auxiliaries Officer and First Lieutenant on USS STETHEM (DDG 63), earning his Surface Warfare Officer designation. He transferred to USS GERMANTOWN (LSD 42) and served as the Navigator. Upon completion of his tour on GERMANTOWN, CDR Gon transferred to Officer Training Command-Newport as a Class Officer and Navigation instructor and earned a Master of Business Administration from Salve Regina University in 2009.
In 2010, CDR Gon laterally transferred to the METOC community and attended the Naval Postgraduate School earning a Master of Science in Physical Oceanography and Meteorology in 2013. In 2016, CDR Gon was selected for the Ph.D. program at Naval Postgraduate School. In 2019, CDR Gon earned his Doctor of Philosophy in Oceanography.
CDR Gon served as Ship’s Oceanographer for USS KEARSARGE (LHD 3) and Operations Officer at Fleet Weather Center San Diego. CDR Gon recently completed service in Fifth Fleet as the Fleet Oceanographer and Maritime Operations Center Executive Officer.
CDR Gon currently serves as the Commanding Officer, Naval Ice Center, and the Director, U.S. National Ice Center.
U.S. National Ice Center
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