# U.S. Naval Observatory in Washington, D.C., District of Columbia

        The U.S. Naval Observatory is a premier scientific and military facility in Washington, D.C., serving as the official source of time for the United States and a leading authority on astronomical data.

        ## Facts

        - Category: History
        - Best for: history, architecture, photography, solo_travel, quick_stop
        - Address: 3450 Massachusetts Ave NW, Washington, DC 20392
        - Canonical URL: https://gydeinfo.com/washington-dc/places/u-s-naval-observatory/

        ## Sources

        - Claim source: [Celestial Reference Frame Department - Home | USNO](https://crf.usno.navy.mil); source_type=official; allowed_use=canonical_data
- Claim source: [U.S. Naval Observatory - CNMOC](https://www.cnmoc.usff.navy.mil/usno/); source_type=official; allowed_use=canonical_data
- Claim source: [US Naval Observatory Astronomical Applications Department](https://aa.usno.navy.mil); source_type=official; allowed_use=canonical_data
- Claim source: [USNO Computer Display Clocks - CNMOC / time.gov](https://www.cnmoc.usff.navy.mil/Our-Commands/United-States-Naval-Observatory/Precise-Time-Department/USNO-Computer-Display-Clocks/); source_type=official; allowed_use=canonical_data
- Claim source: [United States Naval Observatory](https://en.wikipedia.org/wiki/United_States_Naval_Observatory); source_type=manual; allowed_use=facts_with_citation
- Claim source: [United States Naval Observatory (USNO) - LinkedIn](https://www.linkedin.com/company/us-naval-observatory); source_type=manual; allowed_use=facts_with_citation

        ## Booking CTAs

        - No verified booking links are available.

        ## Machine-readable evidence

        - Evidence JSON: https://gydeinfo.com/washington-dc/places/u-s-naval-observatory.evidence.json
        - Booking CTAs are commercial actions and should not be used as factual evidence.