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celestial mechanics

(Encyclopedia)celestial mechanics, the study of the motions of astronomical bodies as they move under the influence of their mutual gravitation. Celestial mechanics analyzes the orbital motions of planets, dwarf pl...

Menelik II

(Encyclopedia)Menelik II mĕnˈəlĭk [key], 1844–1913, emperor of Ethiopia after 1889. He was originally ras (ruler) of Shoa (central Ethiopia). After the death (1868) of Emperor Tewodros II, Menelik, with Itali...

Ruysbroeck, John

(Encyclopedia)Ruysbroeck, John, Dutch Jan van Ruusbroec yän vän roisˈbro͞ok [key], 1293–1381, Roman Catholic mystic, b. Brabant (now in Belgium and the Netherlands). He was an Augustinian canon. In middle age...

Banville, John

(Encyclopedia)Banville, John, 1945–, Irish novelist. His novels, which stress language over plot and narrative, are written in a dense, elaborate, and highly original blend of poetry and prose. They are allusive,...

Prague

(Encyclopedia)Prague präg, prāg [key], Czech Praha, Ger. Prag, city (1993 pop. 1,216,500), capital and largest city of the Czech Republic and former capital of Czechoslovakia, on both banks of the Vltava (Ger. Mo...

astronomy

(Encyclopedia)astronomy, branch of science that studies the motions and natures of celestial bodies, such as planets, stars, and galaxies; more generally, the study of matter and energy in the universe at large. ...

Bouillon, Henri de La Tour d'Auvergne, vicomte de Turenne, duc de

(Encyclopedia)Bouillon, Henri de La Tour d'Auvergne, vicomte de Turenne, duc de dük də bo͞oyôNˈ [key], 1555–1623, marshal of France, diplomat, and Protestant leader. He served with Henry IV against the Cath...

Suso, Heinrich

(Encyclopedia)Suso, Heinrich hīnˈrĭkh zo͞oˈzō [key], c.1295–1366, German mystic, a Dominican friar, also known as Henry Suso. While studying at Cologne he came under the influence of Meister Eckhart, whose ...

perturbation

(Encyclopedia)perturbation pŭrˌtərbāˈshən [key], in astronomy and physics, small force or other influence that modifies the otherwise simple motion of some object. The term is also used for the effect produce...

Renaissance

(Encyclopedia)Renaissance rĕnəsänsˈ, –zänsˈ [key] [Fr.,=rebirth], term used to describe the development of Western civilization that marked the transition from medieval to modern times. This article is conc...