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North Richland Hills

(Encyclopedia)North Richland Hills, town (1990 pop. 45,895), Tarrant co., N Tex., a residential suburb of Fort Worth; inc. 1953. Corrugated boxes, food products, and textiles are manufactured. The town grew markedl...

North Saint Paul

(Encyclopedia)North Saint Paul, village (1990 pop. 12,376), Ramsey co., SE Minn., a suburb of St. Paul, in a lake resort region; inc. 1888. Electronic equipment, concrete products, furniture, roofing materials, arr...

North Valley Stream

(Encyclopedia)North Valley Stream, uninc. town (1990 pop. 14,574), Nassau co., SE N.Y., on Long Island. It is chiefly residential.

North West Company

(Encyclopedia)North West Company, fur-trading organization in North America in the late 18th and early 19th cent.; it was composed of Montreal trading firms and fur traders. After 1810 the rivalry between the Nor...

Whitehead, Alfred North

(Encyclopedia)Whitehead, Alfred North, 1861–1947, English mathematician and philosopher, grad. Trinity College, Cambridge, 1884. There he was a lecturer in mathematics until 1911. At the Univ. of London he was a ...

Arctic Circle

(Encyclopedia)Arctic Circle, imaginary circle on the surface of the earth at 661⁄2°N latitude, i.e., 231⁄2° south of the North Pole. It marks the northernmost point at which the sun can be seen at the winter ...

Antarctic Circle

(Encyclopedia)Antarctic Circle, imaginary circle on the surface of the earth at 661⁄2°S lat., i.e., 231⁄2° north of the South Pole. It marks the southernmost point at which the sun can be seen at the winter s...

hour circle

(Encyclopedia)hour circle, in astronomy, a secondary axis in the equatorial coordinate system. The hour circle of a celestial body is the great circle on the celestial sphere that passes through both the body and t...

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...

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