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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...

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...

Kensico Reservoir

(Encyclopedia)Kensico Reservoir kĕnˈzĭkō [key], c.4 sq mi (10 sq km), SE N.Y., N of White Plains, formed by Kensico Dam (completed 1915) on the Bronx River. A principal unit in the New York City water supply sy...

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...

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...

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...

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...