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Konaré, Alpha Oumar

(Encyclopedia)Konaré, Alpha Oumar, 1946–, Malian politcal leader. He served as Mali's youth, sports, and culture minister (1978–80); was a professor of history and archaeology; founded and edited a cultural re...

Truth or Consequences

(Encyclopedia)Truth or Consequences, city (1990 pop. 6,221), seat of Sierra co., SW N.Mex., on the Rio Grande between the Black Range (W) and Jornada del Meurto desert basin (E); inc. 1916 as Hot Springs, renamed 1...

maser

(Encyclopedia)maser māˈzər [key], device for creation, amplification, and transmission of an intense, highly focused beam of high-frequency radio waves. The name maser is an acronym for microwave amplification b...

Eratosthenes

(Encyclopedia)Eratosthenes ĕrətŏsˈthənēz [key], c.275–c.195 b.c., Greek scholar, b. Cyrene. A pupil of Callimachus in Athens, he became (c.240 b.c.) head of the library at Alexandria. Known for his versatil...

Painlevé, Paul

(Encyclopedia)Painlevé, Paul pōl păNləvāˈ [key], 1863–1933, French statesman and mathematician. A mathematical prodigy when a child, he entered on a career devoted to science. He was a professor at the Sorb...

Ritchey, George Willis

(Encyclopedia)Ritchey, George Willis, 1864–1945, American astronomer, b. Meigs co., Ohio, studied at the Univ. of Cincinnati (1883–84, 1886–87). He was superintendent of instrument construction (1899–1904) ...

Biot, Jean Baptiste

(Encyclopedia)Biot, Jean Baptiste zhäN bätēstˈ byō [key], 1774–1862, French physicist, grad. École Polytechnique (1797). He taught mathematics at Beauvais before becoming (1800) professor of mathematical ph...

zenith

(Encyclopedia)zenith, in astronomy, the point in the sky directly overhead; more precisely, it is the point at which the celestial sphere is intersected by an upward extension of a plumb line from the observer's lo...

proper motion

(Encyclopedia)proper motion, in astronomy, apparent movement of a star on the celestial sphere, usually measured as seconds of arc per year; it is due both to the actual relative motions of the sun and the star thr...

Davis, Sir Colin Rex

(Encyclopedia)Davis, Sir Colin Rex, 1927–2013, English conductor. Davis began his musical career as a clarinetist, and was a self-taught conductor. After serving with the Sadler's Wells Opera, he was the conducto...