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Dr. Rachel Dudik named as new Scientific Director, USNO (01/05/2024) USNO Celebrates 150th Anniversary of "First Light" of the "Great Equatorial" Telescope (11/13/2023) USNO Hosts Delegation From International Astronomical Union (05/10/2023) U.S. Naval Observatory Hosts Hall of Fame Ceremony for GPS Pioneer (04/19/2023) USNO Astronomer Leads Effort to Precisely Locate Sagittarius A* in the International Celestial Reference Frame Using Absolute Astrometry (01/19/2023) USNO Astronomer Makes Major Breakthrough in Unifying the Celestial Reference Frame (12/7/2022) USNO Astronomer Leads Study that Questions Structure of the Universe (10/11/2022) The "Shortest" Day? (8/8/2022) USNO Astronomers Create New Catalog of the Fundamental Properties of Supermassive Black Holes that Comprise the ICRF (6/17/2022) Captain Hartwell F. "Rip" Coke becomes 58th Superintendent, U.S. Naval Observatory (01/12/2022) USNO Marks 50 Year Anniversary of Breakthrough Relativity Experiment​ (10/15/2021) USNO Astronomer Leads Breakthrough Study that Questions Current Cosmological Understanding of the Universe (3/1/2021) USNO Astronomers Peer into Hearts of Supermassive Black Holes; Discover New Relationships Between “Quiet” and “Noisy” Black Holes (3/1/2021) Are Negative Leap Seconds In Our Future? (2/11/2021) In Memoriam: Paul D. Shankland, Ph.D., 1961 - 2020 In Memoriam: Victor J. Slabinski, Ph.D., 1940 - 2020 USNO’s James M. Gilliss Library Joins Consortium (4/14/2020) USNO Staff Members Named as First AAS Fellows (4/10/2020) USNO Breaks Ground on New Master Clock Facility (2/10/2020) CAPT David R. Kuehn, USN becomes 57th Superintendent, USNO (10/25/2019) USNO’s NISTEx-II Instrument Successfully Launched on May 4, 2019 (5/13/2019)