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sunspots

(Encyclopedia)sunspots, dark, usually irregularly shaped spots on the sun's surface that are actually solar magnetic storms. The spots are darker because the temperature of the spots is lower than that of the surro...

Gibbs, James

(Encyclopedia)Gibbs, James, 1682–1754, English architect, b. Scotland, studied in Rome under Carlo Fontana. Returning to England in 1709, he was appointed a member of the commission authorized to build 50 churche...

German Catholics

(Encyclopedia)German Catholics, religious groups founded in 1844 by dissidents from the Roman Catholic Church. They were led by two excommunicated priests, Johann Czerski of Schneidemühl, Posen, and Johann Ronge o...

Dio Cassius

(Encyclopedia)Dio Cassius (Cassius Dio Cocceianus) dīo kăshˈəs [key], c.155–235?, Roman historian and administrator, b. Nicaea in Bithynia. He was a grandson of Dio Chrysostom. His rise in civil and military ...

château

(Encyclopedia)château shătōˈ, Fr. shätōˈ [key], royal or seignioral residence and stronghold of medieval France—the counterpart of the English castle of the period. In such a fortress, peasants of the surr...

degree-day

(Encyclopedia)degree-day, a unit of measure used to estimate the fuel and power requirements in heating and cooling a building; it is equal to a difference of 1 degree between the outdoor daily average temperature ...

chamber music

(Encyclopedia)chamber music, ensemble music for small groups of instruments, with only one player to each part. Its essence is individual treatment of parts and the exclusion of virtuosic elements. Originally playe...

Tsin

(Encyclopedia)Tsin or Chin both: jhĭn [key], dynasty of China that ruled from 265 to 420, after the period of the Three Kingdoms. It was divided into two phases: the Western Tsin (265–317) and the Eastern Tsin (...

Catalan art

(Encyclopedia)Catalan art kătˈəlăn, –lən [key]. In Catalonia and the territories of the counts of Barcelona, art flowered in the early Middle Ages and continued to flourish through the Renaissance. Some of t...

mass extinction

(Encyclopedia)mass extinction, the extinction of a large percentage of the earth's species, opening ecological niches for other species to fill. There have been at least ten such events. The five greatest were thos...