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conjunction, in astronomy

(Encyclopedia)conjunction, in astronomy, alignment of two celestial bodies as seen from the earth. Conjunction of the moon and the planets is often determined by reference to the sun. When a body is in conjunction ...

albedo

(Encyclopedia)albedo ălbēˈdō [key], reflectivity of the surface of a planet, moon, asteroid, or other celestial body that does not shine by its own light. Albedo is measured as the fraction of incident light th...

Encke, Johann Franz

(Encyclopedia)Encke, Johann Franz yōˈhän fränts ĕngˈkə [key], 1791–1865, German astronomer. He was assistant (1816–22) and director (1822–25) of the observatory at Seeberg (near Gotha) and director (fr...

Tannhäuser

(Encyclopedia)Tannhäuser tänˈhoizər [key], 13th cent., German minnesinger, whose adventurous wanderings became the subject of legend. Sixteen of his own lyrics are extant, including Buszlied (Song of Repentance...

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...

Botticelli, Sandro

(Encyclopedia)Botticelli, Sandro älĕssänˈdrō dē märēäˈnō fēlēpāˈpē [key]. He was apprenticed to Fra Filippo Lippi, whose delicate coloring can be seen in such early works as the Adoration of the Kin...

week

(Encyclopedia)week, period of time shorter than the month, commonly seven days. The ancient Egyptians used a 10-day period, as did the French under the short-lived French Revolutionary calendar. In many regions a f...

Evans, Caradoc

(Encyclopedia)Evans, Caradoc, 1883–1945, Anglo-Welsh novelist and short-story writer. His chief works are his short-story collections, My People (1915), Capel Sion (1916), and My Neighbors (1919), and his novel N...

Providence

(Encyclopedia)Providence, city (1990 pop. 160,728), state capital and seat of Providence co., NE R.I., a port at the head of Providence Bay; founded by Roger Williams 1636, inc. as a city 1832. The largest city in ...

Gill, Sir David

(Encyclopedia)Gill, Sir David gĭl [key], 1843–1914, Scottish astronomer, educated at the Univ. of Aberdeen. He made observations of the transits of Venus and Mars and investigated the solar parallax. As astronom...