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Arcturus

(Encyclopedia)Arcturus ärkto͝orˈəs [key], brightest star in the constellation Boötes and 4th-brightest star in the entire sky; Bayer designation Alpha Boötis; 1992 position R.A. 14h15.3m, Dec. +19°13′. An ...

center of mass

(Encyclopedia)center of mass, the point at which all the mass of a body may be considered to be concentrated in analyzing its motion. The center of mass of a sphere of uniform density coincides with the center of t...

Carina

(Encyclopedia)Carina kərēˈnə [key] [Lat.,=the keel], southern constellation, representing the keel of the ancient constellation Argo Navis, or Ship of the Argonauts. Carina contains Canopus, the second brightes...

Trojan asteroids

(Encyclopedia)Trojan asteroids, asteroids that revolve about the sun in the same orbit as a planet, occupying stable positions (known as Lagrangian points) either about 60° ahead of the planet in the orbit or abou...

Thames , river, England

(Encyclopedia)Thames tĕmz [key], Rom. Tamesis, principal river of England, c.210 mi (340 km) long. It rises in four headstreams (the Thames or Isis, Churn, Coln, and Leach) in the Cotswold Hills, E Gloucestershire...

Shaanxi

(Encyclopedia)Shaanxi shĕnˈsēˈ [key] [west of the mountain passes], province (2010 pop. 37,327,378), c.76,000 sq mi (196,840 sq km), N central China. Xi'an is the capital. From north to south Shaanxi has four m...

planet

(Encyclopedia)planet [Gr.,=wanderer], a large nonluminous body of rock, gas, or ice that orbits the sun or another star, has a rounded shape due to gravity, and has cleared its orbit of smaller objects. The term, o...

Butler, John

(Encyclopedia)Butler, John, 1728–96, Loyalist commander in the American Revolution, b. New London, Conn. He served in the French and Indian Wars and distinguished himself especially by leading the Native American...

Rhône, river, Switzerland and France

(Encyclopedia)Rhône, Lat. Rhodanus, river, 505 mi (813 km) long, rising in the Rhône glacier, NE Valais, Switzerland. It flows west through a narrow, flat valley that separates the Bernese Alps from the Pennine A...

pemmican

(Encyclopedia)pemmican pĕmˈĭkən [key], a travel food of the Native North American. Slices of lean venison or buffalo meat were sun dried, pounded to a paste, and packed with melted fat in rawhide bags. Dried cu...