United States Naval Observatory

6 December 1830

The **United States Naval Observatory** (USNO) is one of the oldest scientific agencies in the United States, with a primary mission to produce Positioning, Navigation, and Timing (PNT) for the U.S. Navy and the U.S. Department of Defense. *(cited from Wikipedia [English])*

• Astronomical Almanac for the Year 1993
• 2002 Nautical Almanac Commercial Edition
• Annual report
• Catalogue of stars observed at the United States Naval observatory
• Catalogue of stars observed at the United States Naval observatory during the years 1845 to 1871
• Determination of the difference of longitude between Washington and Paris 1913-1914
• Instructions for observing the total solar eclipse of July 29, 1878
• Instructions for observing the transit of Venus, December 8-9, 1874
• Instruments and publications of the United States Naval Observatory
• Letter of the Secretary of the Navy, communicating in compliance with a resolution of the 19th of March last [1866] a report of Rear Admiral Charles H. Davis, Superintendent of the Naval Observatory, in relation to the various proposed lines for interocea
• Publications of the United States Naval Observatory, Second series
• Report on interoceanic canals and railroads between the Atlantic and Pacific Oceans