Old Naval Observatory
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The Old Naval Observatory is a historic site at 23rd and E Street in Northwest, Washington, D.C. It is where the United States Naval Observatory was located from 1844 to 1893, when it moved to its pre
US Naval Observatory
The campus in 1936, looking east. The NIH buildings are along the bottom, the Naval Hospital is at center, and the old observatory is at top left.
Washington meridians
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The Washington meridians are four meridians that were used as prime meridians in the United States which pass through Washington, D.C. The four that have been specified are:
Old Naval Observatory
…to its present grounds. The original observatory building, built 1839–40, still stands, and is a designated National Historic Landmark as of 1965. The Washington meridian of 1850 passes through the Observatory. The campus around the old observatory is split into two parts: the Potomac Annex to the east (where the observatory…
West side of Jefferson Pier in April 2011 with Washington Monument in background.
Zero Milestone, 1923, looking north toward the White House.
Tablet facing 16th Street, NW, on west wall of Meridian Hill Park in 2006. The tablet states that a Washington Meridian marker stone was formerly located 52 feet 9 inches (16.1 m) west of the tablet.
Entrance marker stone near Silver Spring in traffic circle (Blair Circle) in December 2011