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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...

Pallas, in astronomy

(Encyclopedia)Pallas pălˈəs [key], in astronomy, 2d asteroid to be discovered. It was found in 1802 by H. Olbers. The second largest asteroid, it has a diameter of c.300 mi (480 km). Its orbit has a semimajor ax...

Kanchenjunga

(Encyclopedia)Kanchenjunga, Kanchanjanga kĭnˌchənjo͝ongˈgə [key], mountain, on the India-Nepal border, E Himalayas; geologically regarded as part of the main axis of the Himalayan range. The third highest mo...

day

(Encyclopedia)day, period of time for the earth to rotate once on its axis. The ordinary day, or solar day, is measured relative to the sun, being the time between successive passages of the sun over a stationary o...

symmetry, biological

(Encyclopedia)symmetry, biological, similarity or balance between parts of an organism so that when a straight cut is made through a point or along a line, equal, mirror-image halves are formed. Symmetry in body sh...

nutation

(Encyclopedia)nutation, in astronomy, a slight wobbling motion of the earth's axis. The causes of nutation are similar to those of the precession of the equinoxes, involving the varying attraction of the moon on th...

Ciano, Galeazzo

(Encyclopedia)Ciano, Galeazzo gälāätˈtsō chäˈnō [key], 1903–44, Italian foreign minister and Fascist leader; son of Admiral Costanzo Ciano, conte di Cortellazzo. He entered on a diplomatic career, married...

Hendrix, Jimi

(Encyclopedia)Hendrix, Jimi (James Marshall Hendrix), 1942–70, African-American rock guitarist, b. Seattle, Wash. Hendrix, in his short musical career, was known for an innovative and extremely influential guitar...

Hayes, Carlton Joseph Huntley

(Encyclopedia)Hayes, Carlton Joseph Huntley, 1882–1964, American historian and diplomat, b. Afton, N.Y. He began teaching history at Columbia in 1907, and from 1935 to his retirement in 1950 he held the Seth Low ...

Casablanca Conference

(Encyclopedia)Casablanca Conference, Jan. 14–24, 1943, World War II meeting of U.S. President Franklin Delano Roosevelt and British Prime Minister Winston Churchill at Casablanca, French Morocco. A joint declarat...