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celestial horizon

(Encyclopedia)celestial horizon, one axis of the altazimuth coordinate system. It is the great circle on the celestial sphere midway between the observer's zenith and nadir; it divides the celestial sphere into two...

Bir Tawil

(Encyclopedia)Bir Tawil, unclaimed territory, c.795 sq mi (2,060 km), along the E Egypt-Sudan border W of the Halayeb Triangle. Its unclaimed status arose from the peculiarities the disputed border: Bir Tawil lies ...

Frost, Robert

(Encyclopedia)Frost, Robert, 1874–1963, American poet, b. San Francisco. Perhaps the most popular and beloved of 20th-century American poets, Frost wrote of the character, people, and landscape of New England in ...

Silurian period

(Encyclopedia)Silurian period sĭlo͝orˈēən, sī– [key] [from the Silures, ancient tribe of S Wales, where the period was first studied; named by the British geologist R. I. Murchison], third period of the Pal...

Atitlán

(Encyclopedia)Atitlán ätētlänˈ [key], volcanic lake, 53 sq mi (137 sq km), 17 mi (27.3 km) long and 11 mi (17.7 km) wide, SW Guatemala. One of the most magnificent lakes of Central America, it is set among lof...

Siebengebirge

(Encyclopedia)Siebengebirge zēˈbəngəbĭrˌgə [key] [Ger.,=seven mountains], small wooded range of the Rhenish Slate Mts., W Germany. Of volcanic origin, it extends for c.10 mi (16 km) S of Bonn along the Rhine...

Craddock, Charles Egbert

(Encyclopedia)Craddock, Charles Egbert, pseud. of Mary Noailles Murfree nō-īˈ [key], 1850–1922, American novelist, b. near Murfreesboro, Tenn. She wrote her best works about the mountain people of Tennessee, m...

Turkana, Lake

(Encyclopedia)Turkana, Lake, c.2,500 sq mi (6,475 sq km), NW Kenya and SW Ethiopia, E Africa, in the Great Rift Valley; alt. 1,230 ft (375 m). Surrounded by desolate, volcanic mountains, the 170-mi-long (274-km) al...

Fort Chipewyan

(Encyclopedia)Fort Chipewyan chĭpəwīˈən [key], trading post, NE Alta., Canada, at the west end of Lake Athabasca. The old Fort Chipewyan, on the south shore, was built for the North West Company at the urging ...

Issus

(Encyclopedia)Issus ĭsˈəs [key], ancient town of SE Asia Minor, now in Turkey, 5 mi (8 km) NW of Dörtyol. Located near the head of a gulf (the modern Gulf of Iskenderun), Issus was on a narrow strip of land bac...