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ring, mathematical system

(Encyclopedia)ring, in mathematics, system consisting of a set R of elements and two binary operations, such that addition makes R a commutative group and multiplication is associative and distributes over addition...

equatorial coordinate system

(Encyclopedia)CE5 Equatorial coordinate system equatorial coordinate system, the most commonly used astronomical coordinate system for indicating the positions of stars or other celestial objects on the celesti...

Mammoth Cave National Park

(Encyclopedia)Mammoth Cave National Park, 52,830 acres (21,396 hectares), central Kentucky, authorized 1926, est. 1941. Located in a hilly, forested region, it offers numerous outdoor activities. It is the site of ...

New Madrid Fault System

(Encyclopedia)New Madrid Fault System: see under New Madrid, Mo. ...

National Recovery Administration

(Encyclopedia)National Recovery Administration (NRA), in U.S. history, administrative bureau established under the National Industrial Recovery Act of 1933. In response to President Franklin Delano Roosevelt's cong...

Kitt Peak National Observatory

(Encyclopedia)Kitt Peak National Observatory, astronomical observatory located southwest of Tucson, Ariz.; it was founded in 1958 under contract with the National Science Foundation and is administered by the Assoc...

National Gallery

(Encyclopedia)National Gallery, London, one of the permanent national art collections of Great Britain, est. 1824. The nucleus of museum was the 38-picture collection of the late English banker John Julius Angerste...

national assembly

(Encyclopedia)national assembly, name of a number of past and present constituent or legislative bodies. In France, under the constitutions of the Fourth and Fifth republics, the lower house of parliament has been ...

National Marine Sanctuary Program

(Encyclopedia)National Marine Sanctuary Program, federally owned marine and Great Lakes reserves, administered by the National Oceanic and Atmospheric Administration (NOAA). The program consists of 13 marine sanctu...

National Archives

(Encyclopedia)National Archives, official depository for records of the U.S. federal government, established in 1934 by an act of Congress. Although displeasure concerning the method of keeping national records was...