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Earth Orientation Information Center
General Information about Earth Orientation
Frequently Asked Questions About Earth Orientation
Suggested Reading
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
Scientific Publications
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
Leap Seconds
GPS Information: SA, DGPS, Leap Seconds, etc.
GPS Week Number Rollover
GPS Timing Data and Information
USNO Format Explanation
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Two-Way Satellite Time Transfer (TWSTT)
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The James M. Gilliss Library
Additional Library Resources
Additional Library Resources
Search Tools:
DTIC Multisearch
- Federated search from the Defense Technical Information Center
NASA Technical Reports Server
- NTRS provides access to approximately 500K aerospace related citations, 90K full-text online documents, and 111K images and videos. NTRS numbers continues to grow over time as new scientific and technical information (STI) is created or funded by NASA. The type of information found in NTRS include: conference papers, images, journal articles, photos, meeting papers, movies, patents, research reports, and technical videos.
Worldcat
- Worldwide catalog of libraries' holdings
ARIBIB
- The ARIBIB is an on-line database for astronomical bibliography. Can be searched by an author index or a search form with various options. It does not contain abstracts.
Science.gov
- Science.gov searches over 40 databases and 1,950 selected websites, offering 200 million pages of authoritative U.S. government science information, including research and development results. Includes Astronomy and Space, as well as Earth and Ocean Sciences subject categories.
Astronomy Resources:
Union List of Astronomy Serials (ULAS)
- Bibliographic information for (primarily) non-commercial publications of observatories and institutions concerned with research in astronomy. To each of the approximately 2300 titles included are appended the holding records of 42 contributing libraries, representing the most comprehensive astronomical collections in North America, with selected holdings from China, Europe, India, and South America as well.
Annual Reports of Observatories
- Searchable listing of those observatories that have annual reports and where to find them.
Library of Congress Astronomy/Astrophysics Tracer Bullet
- LC Subject Headings, Bibliographies, and other resources on astronomy.
Library of Congress Selected Internet Resources for Astronomy
Historical
Conference Proceedings
,
Observatory Publications
, and
Journal Publications
scanned by ADS and available on their website.
Outside Repositories with USNO Archival Material:
National Archives
- Records of the U.S. Naval Observatory. Records related to the Depot of Charts and Instruments, 1830-1842, are found in Record Group 45 (Naval Records Collection of the Office of Naval Records and Library). The main source of US Naval Observatory records in Record Group 78.
Library of Congress
- The Library of Congress, Manuscript Division, holds the Naval Historical Foundation collection of correspondence of the Naval Depot of Charts and Instruments, 1833-54, of the Naval Observatory, 1866-1895, and of the Nautical Almanac Office. Also at the Library of Congress are the personal papers of Louis Goldsborough, Charles Wilkes, James Melville Gillis, Cleveland Abbe, Asaph Hall, and Simon Newcomb.
National Air & Space Museum Technical Reference Files: Space History
Naval History and Heritage Command Archives
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