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declination

(Encyclopedia)declination, in astronomy, one of the coordinates in the equatorial coordinate system. The declination of a celestial body is its angular distance north or south of the celestial equator measured alon...

cobaltite

(Encyclopedia)cobaltite kōˈbôltīt, kōbôlˈtīt [key], opaque, silver-white, sometimes reddish or grayish mineral of the pyrite group, a compound of cobalt, arsenic, and sulfur, CoAsS. It occurs in crystals of...

Sipilä, Juha Petri

(Encyclopedia)Sipilä, Juha Petri, 1961–, Finnish political leader, prime minister of Finland (2015–19). A business executive and one of Finland's wealthiest persons, he was first elected to the Finnish parliam...

Sun, river, United States

(Encyclopedia)Sun, river, c.130 mi (210 km) long, rising in the Rocky Mts., NW Mont., and flowing generally E to the Missouri River at Great Falls. The Sun River project of the U.S. Bureau of Reclamation utilizes t...

Aguascalientes, city, Mexico

(Encyclopedia)Aguascalientes, city, capital of Aguascalientes state, central Mexico. The city is a pleasant health resort, noted for its mineral waters and vineyards. Its industries include railroad rep...

zadruga

(Encyclopedia)zadruga, village community of the South Slavs. The zadruga, a large family or clan organized on a patrilineal basis, lived together in one dwelling and held all land, livestock, and money in common. T...

Binns, John Alexander

(Encyclopedia)Binns, John Alexander, c.1761–1813, American agriculturist, b. Loudoun co., Va. He was one of the first to experiment with gypsum as a fertilizer and to convince others of its efficacy. Partly throu...

lighthouse

(Encyclopedia)lighthouse, towerlike structure erected to give guidance and warning to ships and aircraft by either visible or radioelectrical means. Lighthouses were long built to conform in structure to their geog...

Euclid, Greek mathematician

(Encyclopedia)Euclid yo͞oˈklĭd [key], fl. 300 b.c., Greek mathematician. Little is known of his life other than the fact that he taught at Alexandria, being associated with the school that grew up there in the l...

Barnard, Henry

(Encyclopedia)Barnard, Henry, 1811–1900, American educator, b. Hartford, Conn., grad. Yale, 1830. He studied law and was admitted to the bar in 1835. As a member (1837–39) of the Connecticut legislature, he ori...