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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...

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...

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...

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...

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...

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...

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...

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...

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...

Eichler, August Wilhelm

(Encyclopedia)Eichler, August Wilhelm ouˈgo͝ost vĭlˈhĕlm īkhˈlər [key], 1839–87, German botanist. He worked out the symmetry of the parts of a flower and developed a system of plant classification which, ...