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World War II

(Encyclopedia)World War II, 1939–45, worldwide conflict involving every major power in the world. The two sides were generally known as the Allies and the Axis. Although hostilities came to an end in Sept...

kaleidoscope

(Encyclopedia)kaleidoscope kəlīˈdəskōp [key], optical instrument that uses mirrors to produce changing symmetrical patterns. Invented by the Scottish physicist Sir David Brewster in 1816, the device is usually...

National Radio Astronomy Observatory

(Encyclopedia)National Radio Astronomy Observatory (NRAO), federal observatory for radio astronomy, founded in 1956 and operated under contract with the National Science Foundation by Associated Universities, Inc.,...

orientation

(Encyclopedia)orientation, in architecture, the disposition of the parts of a building with reference to the points of the compass. From remote antiquity the traditional belief in the efficacy of religious ceremoni...

Ceres, in astronomy

(Encyclopedia)Ceres sîrˈēz [key], in astronomy, a dwarf planet, the first asteroid to be discovered. It was found on Jan. 1, 1801, by G. Piazzi. He took three distinct observations; on the basis of these the mat...

wheel and axle

(Encyclopedia)CE5 Wheel and axle wheel and axle, simple machine consisting of a wheel mounted rigidly upon an axle or drum of smaller diameter, the wheel and the axle having the same axis. It is fundamentally a...

Wavell, Archibald Percival Wavell, 1st Earl

(Encyclopedia)Wavell, Archibald Percival Wavell, 1st Earl wāˈvəl [key], 1883–1950, British field marshal and viceroy of India. Wavell first saw service in the South African War and in India. During World War I...

Tunis

(Encyclopedia)Tunis to͞onĭs [key], city (1994 pop. 674,100), capital of Tunisia, NE Tunisia, on the Lake of Tunis. Access to the Gulf of Tunis (an arm of the Mediterranean) is by a canal terminating at a subsidia...

Stimson, Henry Lewis

(Encyclopedia)Stimson, Henry Lewis, 1867–1950, American statesman, b. New York City. A graduate of Yale and of Harvard, he became associated with Elihu Root in law practice in New York City. Stimson was (1906–9...

Kepler's laws

(Encyclopedia)CE5 Schematic representation of Kepler's second law: The areas ABF and A′B′F′ are equal and are swept out in equal intervals of time by a planet orbiting around the sun (at F). Kepler's laws...