The United States Naval Observatory is one of the oldest scientific agencies in the United States, with a primary mission to produce Positioning, Navigation and Timing for the United States Navy and the United States Department of Defense. Address: 3450 Massachusetts Ave NW, Washington, DC 20392 Hours: Open ⋅ Closes 5PM Monday9AM–5PMTuesday9AM–5PMWednesday9AM–5PMThursday9AM–5PMFriday9AM–5PMSaturdayClosedSundayClosedSuggest an edit Unable to add this file. Please check that it is a valid photo. Phone: (202) 762-1467Category: : : : : Place name: : : Website: Website: http://www.usno.navy.mil/USNO Category: Observatory Suggest an editUnable to add this file. Please check that it is a valid photo. Unable to add this file. Please check that it is a valid photo. Questions & answers Ask a question Q: Firefox returns "Site is unsecure" when I try to log in.(No answers)See all questions (10) Popular times Mondays MondaysTuesdaysWednesdaysThursdaysFridaysSaturdaysSundaysBased on visits to this place. : Live: Busier than usual6a9a12p3p6p9p12a3a6a9a12p3p6p9p12a3a6aPlan your visitClosed Sundays—pick another dayClosed Saturdays—pick another dayHistogram showing popular times on MondaysHistogram showing popular times on TuesdaysHistogram showing popular times on WednesdaysHistogram showing popular times on ThursdaysHistogram showing popular times on FridaysPeople typically spend up to 3.5 hours here Add a photoThanks for sharing!Your photo will be posted publicly on Google.Contribute MoreDoneUpload public photos of United States Naval Observatory Posting publicly on the Web Write a review ReviewsLarge facility dispensing America's official time, plus a range of astronomical data, tours & more. - Google"Place bringts back good memories." "Lol brought back memories." "Ya man cool place come on down" View all Google reviews

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