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The James Melville Gilliss Library

The  James Melville Gilliss Library located on the grounds of the United States Naval Observatory is one of the preeminent scientific libraries in the United States.

January 2015  Library display : The giants' shoulders  Newton stood on.  Books by Descartes, Kepler, Galileo, Huygens, Wallis  and van Schooten.

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Got a question regarding the USNO Library collection?  Ask the USNO Librarian!


URANIA - The USNO Online Catalog

Search the holdings of the James M. Gilliss library via our online catalog - URANIA.


Quick Link to Astrophysical Data System (ADS)

Search the SAO/NASA Astrophysical Data System (ADS)


Library Collections

Recently Cataloged Books, Electronic Journals, and Publications of the USNO and its staff 


Historical Photos, Artwork, and Objects

A sampling of the historical photos, artwork and objects contained within the library.


Library History

Learn more about the history of the library


Additional Resources

Links to additional online resources

USNO Master Clock Time
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