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Earth Orientation Department
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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
Lieutenant Commander Dylan H. Richmond
Executive Officer, Naval Oceanography Antisubmarine Warfare Center
14 June 2022
Lieutenant Commander Richmond is a native of San Antonio, Texas and graduated from Texas A&M University with a Bachelor of Arts Degree in Economics in 2007 and commissioned from Officer Candidate School Officer Training Command, Newport, RI, in 2008. His assignments in the Surface Warfare Community included division officer tours onboard the USS McCampbell (DDG 85), where he qualified as a Surface Warfare Officer and Engineer Officer of the Watch. He served as Navigator onboard the USS Vicksburg (CG 69). In his shore assignment, he served as an Assistant Officer-in-Charge at Naval Special Warfare Group Two Training Detachment in charge of training all East coast SEAL Teams at Virginia Beach, VA until his lateral transfer into the Information Warfare Community.
As a Cryptologic Warfare Officer, LCDR Richmond was initially assigned to Navy Information Operations Command, Texas. His assignments included: Operations Officer for NSA/CSS Texas Combatting Proliferation branch; Military Deputy Chief for Operational Readiness and Certification for NSA/CSS Computer Network Operations, where he qualified as Senior Watch Officer. He also served as the Legal Officer for NIOC Texas.
After selection into Fleet Scholar Education Program, LCDR Richmond attended Johns Hopkins University where he earned a Master of Science in Systems Informatics.
In his most recent assignment, he served as an Operations Department Head for Direct Support Subsurface at NIOC HI where he oversaw the training, qualification, and deployment of over 140 personnel.
His personal decorations include a Joint Service Commendation Medal, three Navy/Marine Corps Commendation Medal, and two Navy/Marine Corps Achievement Medals. Crews with whom he has served have earned two “Battle E” awards for operational excellence and one Meritorious Unit Commendation. He is married to Leah Richmond and has three children: Wesley, Claire, and Laurel.
Naval Oceanography Antisubmarine Warfare Center
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