Columbia Encyclopedia

Search results

500 results found

Juno, in astronomy

(Encyclopedia)Juno jo͞oˈnō [key], in astronomy, 3d asteroid to be discovered. It was found in 1804 by C. Harding. It has a diameter of c.120 mi (190 km). Its average distance from the sun is 2.67 astronomical un...

ultraviolet astronomy

(Encyclopedia)ultraviolet astronomy, study of celestial objects by means of the ultraviolet radiation they emit, in the wavelength range from about 90 to about 350 nanometers. Ultraviolet (UV) line spectrum measure...

Mercury, in astronomy

(Encyclopedia)Mercury, in astronomy, nearest planet to the sun, at a mean distance of 36 million mi (58 million km); its period of revolution is 88 days. Mercury passes through phases similar to those of the moon a...

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...

Wang Ching-wei

(Encyclopedia)Wang Ching-wei wäng jĭng-wā [key], 1883–1944, Chinese revolutionary and political leader. A supporter of Sun Yat-sen, Wang was sentenced (1910) to life imprisonment for attempting to assassinate ...

Middletown, sociological study

(Encyclopedia)Middletown: see Lynd, Robert Staughton. ...

Cyrano de Bergerac, Savinien

(Encyclopedia)Cyrano de Bergerac, Savinien sävēnyăNˈ sēränōˈ də bĕrzhəräkˈ [key], 1619–55, French novelist. Satirizing the customs and beliefs of his time, he wrote two fantastic romances about visit...

parsec

(Encyclopedia)parsec pärˈsĕc [key] [parallax + second], in astronomy, basic unit of length for measuring interstellar and intergalactic distances, equal to 206,265 times the distance from the earth to the su...

Vesta, in astronomy

(Encyclopedia)Vesta vĕsˈtə [key], in astronomy, the fourth asteroid to be discovered. It was found in 1807 by H. Olbers. It is the third largest asteroid in size, with a diameter of c.326 mi (525 km). Its averag...

Kepler's laws

(Encyclopedia)CE5 Schematic representation of Kepler's second law: The areas ABF and A′B′F′ are equal and are swept out in equal intervals of time by a planet orbiting around the sun (at F). Kepler's laws...