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hour angle

(Encyclopedia)hour angle, in astronomy, a coordinate in the equatorial coordinate system. The hour angle of a celestial body is the angular distance, expressed in hours, minutes, and seconds (one hour equals 15 deg...

Hulse, Russell Alan

(Encyclopedia)Hulse, Russell Alan, 1950–, American astrophysicist, b., New York City, Ph.D. Univ. of Massachusetts, Amherst, 1975. Hulse was a researcher at the Princeton's plasma physics laboratory from 1977 unt...

An Najaf

(Encyclopedia)An Najaf än näˈjäf [key], city (2020 pop. 874,000), S central Iraq, on a lake near the Euphrates River. The city, one of Shi'a Islam's holiest, is also called Mashad A...

Burbidge, Margaret

(Encyclopedia)Burbidge, Margaret, 1925–2020, Anglo-American astronomer, b. England as Eleanor Margaret Peachey. Burbidge; her husband, Geoffrey Burbidge; William Fowler; and Sir Fred Hoyle showed (1956) how heavi...

wedge

(Encyclopedia)wedge, piece of wood or metal thick at one end and sloping to a thin edge at the other; an application of the inclined plane. It is employed in separating two objects from each other or in separating ...

Mesozoic era

(Encyclopedia)Mesozoic era mĕzˌəzōˈĭk [key] [Gr.,=middle life], major division of geologic time (see Geologic Timescale, tablegeologic timescale, table) from 65 to 225 million years ago. Great crustal disturb...

lemur

(Encyclopedia)lemur lēˈmər [key], name for prosimians, or lower primates, of two related families, found only on Madagascar and adjacent islands. Lemurs have monkeylike bodies and limbs, and most have bushy tail...

goatsucker

(Encyclopedia)goatsucker, common name for nocturnal or crepuscular birds of the order Caprimulgiformes, which includes the frogmouth, the oilbird, potoos, and nightjars. Goatsuckers are medium in size and are found...

Tshombe, Moise Kapenda

(Encyclopedia)Tshombe, Moise Kapenda mô-ēsˈ kəpĕnˈdä chōmˈbā [key], 1919–69, political leader in Congo (Kinshasa). He was related to the royal family of the Lunda people and received his education at mi...

Hammarskjöld, Dag

(Encyclopedia)Hammarskjöld, Dag däg hämˈərshōldˌ, Swed. hämˈärshöldˈ [key], 1905–61, Swedish statesman, secretary-general of the United Nations (1953–61). He attended the universities of Uppsala and...