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Contents of Bulletin A
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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
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Naval Oceanography Operations Command
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Public Use of Limitations
Naval Meteorology and Oceanography Command
Captain Kate Hermsdorfer
Commanding Officer, Fleet Weather Center San Diego
03 June 2022
Captain Kate Hermsdorfer is a native of Simsbury, CT. She graduated with distinction from the United States Naval Academy in 2000 with a Bachelor of Science degree in Mathematics. CAPT Hermsdorfer holds Master of Science degrees in Meteorology and Physical Oceanography from the Naval Postgraduate School, and Operations Management from the University of Arkansas.
CAPT Hermsdorfer qualified as a Naval Flight Officer and served as an EA-6B Prowler Electronic Countermeasures Officer before transferring to the Meteorology and Oceanography community in 2010. She earned her Information Warfare Officer qualification in 2012.
At sea, CAPT Hermsdorfer served with the Lancers (VAQ-131) onboard the USS Abraham Lincoln (CVN 72). During that time, she qualified as an EA-6B mission commander and participated in tsunami relief in Indonesia. As an oceanographer, she served as meteorology and oceanography officer, strike operations officer, and officer of the deck underway for USS Dwight D. Eisenhower (CVN 69) in support of Operation Enduring Freedom.
CAPT Hermsdorfer previously commanded Naval Oceanography Mine Warfare Center – home of the world’s finest mine hunters- at Stennis, Mississippi. Her other shore tours include oceanography capabilities and requirements branch head and Naval deputy to NOAA liaison, Office of the Chief of Naval Operations Staff; operations officer, Fleet Numerical Meteorology and Oceanography Center; and policy and procedure assistant branch head, Naval Personnel Command. In January, she assumed command of Fleet Weather Center San Diego.
CAPT Hermsdorfer’s awards include the 2005 EA-6B Student Flight Officer of the Year, the 2012 USS Dwight D. Eisenhower’s Navy Marine Association Peer Leadership, and numerous other individual, campaign, service, and unit awards. She is the proud wife of Joel and mother of Margaret.
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