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Baade, Walter

(Encyclopedia)Baade, Walter välˈtər bäˈdə [key], 1893–1960, German-born American astronomer. From 1919 to 1931 he was on the staff of the Hamburg observatory; from 1931 to 1958, at the Mt. Wilson observator...

convict labor

(Encyclopedia)convict labor, work of prison inmates. Until the 19th cent., labor was introduced in prisons chiefly as punishment. Such work is now considered a necessary part of the rehabilitation of the criminal; ...

Encke, Johann Franz

(Encyclopedia)Encke, Johann Franz yōˈhän fränts ĕngˈkə [key], 1791–1865, German astronomer. He was assistant (1816–22) and director (1822–25) of the observatory at Seeberg (near Gotha) and director (fr...

Piazzi, Giuseppe

(Encyclopedia)Piazzi, Giuseppe jo͞ozĕpˈpā pyätˈtsē [key], 1746–1826, Italian astronomer, a Theatine priest from 1769. He became (1781) professor of mathematics at the Univ. of Palermo, supervised construct...

Jaggar,Thomas Augustus, Jr.

(Encyclopedia)Jaggar,Thomas Augustus, Jr., 1871–1953, American geologist and volcanologist, b. Philadelphia, Ph.D. Harvard, 1897. One of the team of U.S. scientists (1902) who surveyed the eruptions in the West I...

Canary Islands

(Encyclopedia)Canary Islands, Span. Islas Canarias, group of seven islands (2020 est. pop. 2,161,000), 2,875 sq mi (7,445 sq km), autonomous community of Spain, ...

Algiers

(Encyclopedia)Algiers älzhāˈ [key], city (2021 pop. 2,809,158), capital of Algeria, N Algeria, on the Bay of Algiers of the Mediterranean Sea. It is one of the leading ports of North...

Janssen, Pierre Jules César

(Encyclopedia)Janssen, Pierre Jules César pyĕr zhül sāzärˈ zhäNsĕnˈ [key], 1824–1907, French astronomer. In 1857–58, in Peru, he worked on the determination of the magnetic equator; in the Azores (1867...

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