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precession of the equinoxes

(Encyclopedia)CE5 Precession of the equinoxes (the points at which the earth's celestial equator intersects its ecliptic) is due to the slow rotation of the earth's axis around a perpendicular to the ecliptic. ...

work

(Encyclopedia)work, in physics and mechanics, transfer of energy by a force acting to displace a body. Work is equal to the product of the force and the distance through which it produces movement. Although both fo...

Voltaire, François Marie Arouet de

(Encyclopedia)Voltaire, François Marie Arouet de fräNswäˈ märēˈ ärwāˈ də vôltĕrˈ [key], 1694–1778, French philosopher and author, whose original name was Arouet. One of the towering geniuses in lite...

Sankara, Thomas Isidore Noël

(Encyclopedia)Sankara, Thomas 1948–87, president (1983–87) of Burkina Faso. Thomas Sankara, sometimes referred to as the African Che Guevara, was an activist, mil...

Mandan, indigenous people of North America

(Encyclopedia)Mandan mănˈdăn, –dən [key], indigenous people of North America whose language belongs to the Siouan branch of the Hokan-Siouan linguistic stock (see Native American languages). The Mandan were a...

Decatur, Stephen

(Encyclopedia)Decatur, Stephen dēkāˈtər [key], 1779–1820, American naval officer, b. Sinepuxent, near Berlin, Md.; son of a naval officer, Stephen Decatur. After joining the U.S. navy in 1798, he rose to fame...

New Democratic party

(Encyclopedia)New Democratic party (NDP), Canadian political party, founded in 1961 when the Cooperative Commonwealth Federation (CCF) reorganized itself and entered into close ties with Canadian labor unions, espe...

intelligence

(Encyclopedia)intelligence, in psychology, the general mental ability involved in calculating, reasoning, perceiving relationships and analogies, learning quickly, storing and retrieving information, using language...

binary star

(Encyclopedia)CE5 A. Eclipsing binary: Primary component passing behind secondary (dimmer) component B. Light curve for eclipsing binary binary star or binary system, pair of stars that are held together by the...

logical positivism

(Encyclopedia)logical positivism, also known as logical or scientific empiricism, modern school of philosophy that attempted to introduce the methodology and precision of mathematics and the natural sciences into t...