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Indigirka

(Encyclopedia)Indigirka ēndyĭgērˈkə [key], river, NE Siberian Russia, in the Sakha Republic. It rises in the Oymyakon plateau and flows c.1,100 mi (1,770 km) N into the Arctic Ocean. It is navigable (June–Se...

Jackson, Frederick George

(Encyclopedia)Jackson, Frederick George, 1860–1938, British arctic explorer. He explored (1893–94) the tundra in arctic Russia and in Lapland, and he commanded (1894–97) the Jackson-Harmsworth expedition that...

Kane, Elisha Kent

(Encyclopedia)Kane, Elisha Kent, 1820–57, American physician and arctic explorer, b. Philadelphia. Seeking adventure after medical school, Kane entered naval service and before he was 30 had seen many parts of th...

Beaufort Sea

(Encyclopedia)Beaufort Sea bōˈfərt [key], part of the Arctic Ocean, N of Alaska and Canada, between Point Barrow, Alaska, and the Canadian Arctic Archipelago. The Mackenzie River flows into the sea, which is alw...

arc, in geometry

(Encyclopedia)arc, in geometry, a curved line or any part of it; in particular, a portion of the circumference of a circle. The length s of an arc of a circle of radius r and subtending a central angle of θ radian...

circumpolar star

(Encyclopedia)circumpolar star, star whose diurnal circle lies completely above or completely below an observer's horizon. A star whose diurnal circle lies above the horizon never sets, even though it cannot be see...

Viscount Melville Sound

(Encyclopedia)Viscount Melville Sound, 250 mi (402 km) long and 100 mi (161 km) wide, arm of the Arctic Ocean, Northwest Territories and Nunavut, Canada, between Victoria and Prince of Wales islands on the south an...

cone, in mathematics

(Encyclopedia)CE5 Cone cone or conical surface, in mathematics, surface generated by a moving line (the generator) that passes through a given fixed point (the vertex) and continually intersects a given fixed c...

Lockwood, James Booth

(Encyclopedia)Lockwood, James Booth, 1852–84, American arctic explorer, b. Annapolis, Md. In 1873 he was commissioned second lieutenant in the U.S. army. In 1881, Lockwood joined the arctic expedition of Adolphus...

Kotzebue

(Encyclopedia)Kotzebue kŏtˈsəbyo͞o [key], city (1990 pop. 2,751), NW Alaska, on Kotzebue Sound at the tip of Baldwin Peninsula; inc. 1958. It has one of the largest settlements of Eskimos in Alaska. Kotzebue is...