United States Naval Observatory

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United States Naval Observatory,

a federal astronomical observatoryobservatory,
scientific facility especially equipped to detect and record naturally occurring scientific phenomena. Although geological and meteorological observatories exist, the term is generally applied to astronomical observatories.
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, located in Washington, D. C. It evolved from the Navy's oldest scientific institution, the Depot of Charts and Instruments, founded in 1830; the observatory was completed in 1844 and moved to its present site in 1893. It was formerly administered through the Bureau of Navigation and is now under the jurisdiction of the chief of naval operations. The principal instrument at the Washington headquarters is an Alvan Clark 26-in. refracting telescope, which has been in almost continuous operation since its installation in 1873, when it was the largest of its kind in the world. The original mounting and drive were replaced during the 1893 move. Other equipment includes a number of ordinary refracting and reflecting telescopes and special telescopes (photographic zenith tubes) used in the precise determination of time. The observatory's Flagstaff Station in Arizona has 61-in. and 40-in. reflecting telescopes; in 1978, J. Christy discovered Pluto's moon Charon with the 61-in. instrument. The main programs of the Naval Observatory involve continual observations of the positions and motions of celestial bodies for astronomical and navigational purposes and for the derivation and broadcasting of accurate time signals. Atomic clocks, cesium clocks, mercury ion clocks, and hydrogen maser frequency standards are all used for the observatory's time system, which is accurate to within a few billionths of a second per day. Since 1894 the U.S. Naval Observatory has included the Nautical Almanac Office, which publishes the American Ephemeris and Nautical Almanac. The observatory also has an extensive library.
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United States Naval Observatory

(USNO) The national observatory in Washington D.C. concerned mainly with astrometric measurements for the purposes of timekeeping and navigation. The USNO is a department of the US Navy, and part of its mission is “to provide astronomical and timing data required by the Navy and other components of the Department of Defense for navigation, precise positioning, and command, control, and communications” and to make such information publicly available. The USNO was founded in 1830 as the Depot of Charts and Instruments. The original observatory was built in 1833, but the site has since been moved and expanded several times. In 1855, the UNSO began publishing astronomical and nautical almanacs, and in 1904 it broadcast the world's first time signal. Today its products include computer programs and Web-based astronomy- and time-related applications.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006
References in periodicals archive ?
They were only detected in 1877 by American astronomer Asaph Hall using the recently commissioned 26-inch Clark refractor at the U.S. Naval Observatory, decades after considerably fainter satellites of Saturn, Uranus, and Neptune were discovered.
Vice President Mike Pence, wife Karen and adult children Michael, Charlotte and Audrey are the seventh family to inhabit the 33-room house on the grounds of the U.S. Naval Observatory. A year in, they have put their own spin on it.
Computer Engineer Brent Misenheimer, Computer Scientists Nicholas Bartkowiak, Kyle Smith and Stephen Bowman, and Electronics Engineer Kerry Loyd won Team Award honors for providing an end-to-end solution for the U.S. Naval Observatory (USNO) mission environment.
The copy details the date and location of the image, and provides context to the remarkable story of each scene, such as the history of Mount Rushmore, the emergence of modern jazz, the origins of the U.S. Naval Observatory in Washington, D.C.
Staff members of the U.S. Naval Observatory (USNO) observed Earth Day on April 21, 2017 with base wide clean ups at their Washington District of Columbia and Flagstaff, Arizona facilities to Washington, participants fanned out over the 72-acre site and removed over 300 pounds of trash and detritus.
Geoff Chester, an astronomer at the U.S. Naval Observatory, told (https://www.washingtonpost.com/news/capital-weather-gang/wp/2016/12/28/on-dec-31-an-extra-leap-second-will-be-added-to-our-universal-clocks-because-waves/?utm_term=.b50fd18c57da) the Washington Post that the master clock at the facility will add the extra second.
Geoff Chester, spokesman for the U.S. Naval Observatory stated that the object was likely a space rock somewhere between the size of a toaster and a refrigerator when it entered the atmosphere.
According to the U.S. Naval Observatory, every day ends with three different twilights.
But the late Thomas Van Flandern, a Yale-trained astronomer who spent 20 years in his field at the U.S. Naval Observatory in Washington, D.C., also started his own nonprofit research organization, Meta Research, which focused on alternative astronomical ideas.
Joe Biden was sworn in for his second term as vice president earlier Sunday, taking the oath from Supreme Court Justice Sonya Sotomayor at his official residence at the U.S. Naval Observatory.
Pattern Outdoor Lighting Code, written by Chris Luginbuhl of the U.S. Naval Observatory's Flagstaff station.

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