Marker Logo
THE HISTORICAL
MARKER DATABASE
“Bite-Size Bits of Local, National, and Global History”
Foggy Bottom in Northwest Washington in Washington, District of Columbia — The American Northeast (Mid-Atlantic)
 

U.S. Naval Observatory
⎯⎯⎯
The Prime Meridian

 
 
U.S. Naval Observatory / The Prime Meridian Marker image. Click for full size.
1. U.S. Naval Observatory / The Prime Meridian Marker
Inscription. [Top plaque:]
U.S. Naval Observatory
Designed by LT James M. Gilliss in 1842, the U.S. Naval Observatory occupied this site from 1844 to 1893. In 1894 the domed structure became home to the Naval Museum of Hygiene. Eight years later the Naval Medical School moved here from Brooklyn, New York.

[Bottom plaque:]
The Prime Meridian
In the early 1850's the 0 degree meridian for the United States was established here. It passed through the center of the U.S. Naval Observatory's central dome. This Prime Meridian became the reference for determining the north-south boundaries of several western states.
 
Topics. This historical marker is listed in these topic lists: MilitaryNotable BuildingsScience & Medicine. A significant historical year for this entry is 1842.
 
Location. 38° 53.728′ N, 77° 3.086′ W. Marker is in Northwest Washington in Washington, District of Columbia. It is in Foggy Bottom. It can be reached from 23rd Street Northwest south of E Street Northwest, on the right when traveling south. Touch for map. Marker is at or near this postal address: 2300 E Street Northwest, Washington DC 20037, United
Paid Advertisement
Click or scan to see
this page online
States of America. Touch for directions.

Regionally, this marker is in the Washington Metropolitan Area. It is also in the American Northeast, in the Upper South, in the Mid-Atlantic, in the Tidewater, and in the Chesapeake Bay Region. Globally, it is in the North Atlantic Region, North America, the Western Hemisphere, the Western World, and the Anglosphere.

Other nearby markers. At least 8 other markers are within walking distance of this marker: Benjamin Rush (a few steps from this marker); Building 2 (within shouting distance of this marker); Radford House (within shouting distance of this marker); Building 5 (about 300 feet away, measured in a direct line); Department of State (about 500 feet away); Bernardo de Gαlvez Memorial (approx. 0.2 miles away); Ally for Independence (approx. 0.2 miles away); Braddock’s Rock (approx. 0.2 miles away). Touch for a list and map of all markers in Northwest Washington.
 
 
Credits. This page was last revised on January 30, 2023. It was originally submitted on December 31, 2018. This page has been viewed 540 times since then and 25 times this year. Photo   1. submitted on December 31, 2018. • Andrew Ruppenstein was the editor who published this page.
m=128012

CeraNet Cloud Computing sponsors the Historical Marker Database.
This website earns income from purchases you make after using our links to Amazon.com. We appreciate your support.
Paid Advertisement
Jul. 6, 2026