bn:03185182n
Noun Named Entity
Categories: United States Naval Observatory, Time balls, Astronomical observatories in Washington, D.C., Embassy Row, National Register of Historic Places in Washington, D.C.
EN
United States Naval Observatory  Depot of Charts and Instruments  Fred Covington  Naval Observatory  Naval Observatory, District of Columbia
EN
The United States Naval Observatory is a scientific and military facility that produces geopositioning, navigation and timekeeping data for the United States Navy and the United States Department of Defense. Wikipedia
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EN
The United States Naval Observatory is a scientific and military facility that produces geopositioning, navigation and timekeeping data for the United States Navy and the United States Department of Defense. Wikipedia
Scientific agency and observatory in Washington, D.C., United States Wikidata