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Sacrobosco, Johannes de

(Encyclopedia)Sacrobosco, Johannes de yōhänˈəs də săkrōbŏsˈkō [key], or John of Hollywood, c.1200–1256, English mathematician and astronomer. He wrote several widely read and influential books: Algorism...

Bednorz, Johannes Georg

(Encyclopedia)Bednorz, Johannes Georg yōhänˈəs gāôrkhˈ bĕdˈnôrts [key], 1950–, German physicist. After earning his doctorate from the Swiss Federal Institute of Technology, he began (1982) work at the I...

Tillich, Paul Johannes

(Encyclopedia)Tillich, Paul Johannes tĭlˈĭk [key], 1886–1965, American philosopher and theologian, b. Germany, educated at the universities of Berlin, Tübingen, Halle, and Breslau. In 1912 he was ordained a m...

Becher, Johannes Robert

(Encyclopedia)Becher, Johannes Robert yōhänˈəs rōˈbĕrt bĕkhˈər [key], 1891–1958, German poet and essayist. After an early association with the Expressionist movement, Becher turned to Communism. His ant...

Witteveen, H. Johannes

(Encyclopedia)Witteveen, H. Johannes (Hendrikus Johannes Witteveen), 1921–2019, Dutch economist and political leader. After receiving his doctorate from the Netherlands School of Economics (now Erasmus Univ. Rott...

Wolf, Markus Johannes

(Encyclopedia)Wolf, Markus Johannes vôlf [key], 1923–2006, East German spymaster. A legendary cold-war espionage chief, he was called “the man without a face” because until 1978 there was no known photograp...

Purkinje, Johannes Evangelista

(Encyclopedia)Purkinje, Johannes Evangelista yōhänˈəs āˌväng-gālĭsˈtä po͝orˈkĭnyā [key], 1787–1869, Czech physiologist. While professor (1823–50) at the Univ. of Breslau he pioneered in establish...

planetary system

(Encyclopedia)planetary system, a star and all the celestial bodies bound to it by gravity, especially planets and their natural satellites. Until the last decade of the 20th cent., the only planetary system known ...

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