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ecliptic coordinate system

(Encyclopedia)ecliptic coordinate system, an astronomical coordinate system in which the principal coordinate axis is the ecliptic, the apparent path of the sun through the heavens. The ecliptic poles are the two p...

non-Euclidean geometry

(Encyclopedia)non-Euclidean geometry, branch of geometry in which the fifth postulate of Euclidean geometry, which allows one and only one line parallel to a given line through a given external point, is replaced b...

Ovechkin, Alexander Mikhailovich

(Encyclopedia)Ovechkin, Alexander Mikhailovich, 1985–, Russian hockey player. He joined Dynamo Moscow, a professional team, at 16, and led Russia to a junior championship. A Washington Capitals first-round pick i...

plane

(Encyclopedia)plane, in mathematics, flat surface of infinite extent but no thickness. An example of a plane, or more exactly of a bounded portion of a plane, is the surface forming one face, or side, of a cube. A ...

Cleaver, Eldridge

(Encyclopedia)Cleaver, Eldridge (Leroy Eldridge Cleaver), 1935–98, African-American social activist, b. Wabbaseka, Ark. Growing up in Los Angeles, he spent much of 1954–66 in prison for various crimes including...

Böhm-Bawerk, Eugen

(Encyclopedia)Böhm-Bawerk, Eugen oigānˈ bömˈ-bäˈvĕrk [key], 1851–1914, Austrian economist. Three times minister of finance (1895, 1897, and 1900), he initiated important tax reforms and farsighted financi...

analytic geometry

(Encyclopedia)analytic geometry, branch of geometry in which points are represented with respect to a coordinate system, such as Cartesian coordinates, and in which the approach to geometric problems is primarily a...

paleomagnetism

(Encyclopedia)paleomagnetism, study of the intensity and orientation of the earth's magnetic field as preserved in the magnetic orientation of certain minerals found in rocks formed throughout geologic time. Paleom...

triceps

(Encyclopedia)triceps, any muscle having three heads, or points of attachment, but especially the triceps brachii at the back of the upper arm. One head originates on the shoulder blade and two on the upper-arm bon...

Lancaster, John of, duke of Bedford

(Encyclopedia)Lancaster, John of, duke of Bedford: see Bedford, John of Lancaster, duke of. ...