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Mission & Vision
Naval Oceanographic Office
Fleet Numerical Meteorology & Oceanography Center
United States Naval Observatory
News from the Naval Observatory
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
Senior Enlisted Advisor
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 James A. Scianna
Commanding Officer, Strike Group Oceanography Team San Diego
15 June 2022
Commander James Scianna is a native of Connecticut. He graduated from the Pennsylvania State University with a Bachelor of Science in Meteorology and was commissioned in May 2004. He also obtained a Master of Business Administration from the University of Maryland Global Campus in June 2009 and a dual Master’s Degree in Meteorology and Physical Oceanography from the Naval Postgraduate School in December 2013.
Afloat, CDR Scianna served on USS John Paul Jones as the First Lieutenant and earned his Surface Warfare Officer qualification during a 2005 Western Pacific deployment. He was also assigned to the aircraft carriers USS Ronald Reagan and USS George Washington, where he served as OA division officer for RIMPAC 2014 and Southern Seas 2015 and served as the Hull Swap Coordinator for the Navy’s three carrier swap initiative.
CDR Scianna was redesignated to Special Duty Officer (Oceanography) in December 2005, and reported to the Naval Maritime Forecast Center, Norfolk, VA where he served as Command Duty Officer, Ship Router, and Assistant Operations Officer. He has also served as the Operations Officer at the National/Naval Ice Center, Suitland, MD and Oceanographic Survey Ship and Littoral Battlespace Sensing Unmanned Undersea Vehicle Requirements Officer on the staff of the Oceanographer of the Navy. In December 2017, he reported to Naval Computer and Telecommunications Station Sicily where he served as Executive Officer. Most recently he was assigned to the Joint Chiefs of Staff, J35, to serve as a writer for the Secretary of Defense Orders Book.
CDR Scianna assumed his current position as Commanding Officer, Strike Group Oceanography Team San Diego in April 2022. CDR Scianna’s personal awards include the Defense Meritorious Service Medal, Meritorious Service Medal, Navy and Marine Corps Commendation Medal with five awards, Joint Service Achievement Medal, and the Navy and Marine Corps Achievement Medal with two awards.
CDR Scianna is married to his wife Janine and they have three children together (Tessa, Anthony, and Christian).
Strike Group Oceanography Team San Diego
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Veterans Crisis Line
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Commander, Naval Meteorology and Oceanography Command | 1100 Balch Blvd. | Stennis Space Center, Mississippi 39529
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