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apsis

(Encyclopedia)CE5 Apsis points, or apsides, in the earth's orbit: At perihelion the earth is closest to the sun and at aphelion it is farthest from the sun. apsis (pl. apsides), point in the orbit of a body whe...

Eris, in astronomy

(Encyclopedia)Eris, in astronomy, the largest known dwarf planet. Eris, whose highly eccentric elliptical orbit ranges from 38 AU to 97 AU and is inclined more than 44°, is the largest known object of the Kuiper b...

Cauca

(Encyclopedia)Cauca kouˈkä [key], river, c.800 mi (1,290 km) long, rising in the Cordillera Central, near Popayán, W Colombia. It flows north in a rift valley between the Cordillera Central and Cordillera Occide...

Surma

(Encyclopedia)Surma sûrˈmə, so͝orˈmä [key], river, 320 mi (515 km) long, rising in the Manipur hills, NE India, and flowing generally W through the Surma valley, where the river is dispersed into numerous str...

finfoot

(Encyclopedia)finfoot, bird: see sun grebe.

Hess, Victor Francis

(Encyclopedia)Hess, Victor Francis, 1883–1964, American physicist, b. Austria, Ph.D. Univ. of Graz, 1906. After teaching at the universities of Graz and Innsbruck, he came to the United States in 1938 and was lat...

Howard, Roy Wilson

(Encyclopedia)Howard, Roy Wilson, 1883–1964, American newspaper publisher, b. Gano, Ohio. He became New York manager of the United Press (UP) in 1907. During World War I, as president and general manager of UP, H...

Vulcan, in astronomy

(Encyclopedia)Vulcan, in astronomy, hypothetical planet whose existence was proposed by Le Verrier to explain part of the advance of the perihelion of Mercury, not all of which could be accounted for by gravitation...

Tempe, Vale of

(Encyclopedia)Tempe, Vale of, Gr. Témbi, valley, c.5 mi (8 km) long, E central Greece, NE Thessaly, between Mt. Olympus and Mt. Óssa. Traversed by the Piniós River, the valley is famous for its rugged grandeur. ...

retrograde motion

(Encyclopedia)retrograde motion, in astronomy, real or apparent movement of a planet, dwarf planet, moon, asteroid, or comet from east to west relative to the fixed stars. The most common direction of motion in the...