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Jim Crow laws

(Encyclopedia)Jim Crow laws, in U.S. history, statutes enacted by Southern states and municipalities, beginning in the 1880s, that legalized segregation between blacks and whites. The name is believed to be derived...

fugitive slave laws

(Encyclopedia)fugitive slave laws, in U.S. history, the federal acts of 1793 and 1850 providing for the return between states of escaped black slaves. Similar laws existing in both North and South in colonial days ...

fair-trade laws

(Encyclopedia)fair-trade laws, in the United States, a former group of statutes that permitted manufacturers to specify the minimum retail price of a commodity. The first fair-trade law was adopted (1931) by Califo...

pure-food laws

(Encyclopedia)pure-food laws: see food adulteration. ...

celestial mechanics

(Encyclopedia)celestial mechanics, the study of the motions of astronomical bodies as they move under the influence of their mutual gravitation. Celestial mechanics analyzes the orbital motions of planets, dwarf pl...

Asada Goryu

(Encyclopedia)Asada Goryu äsäˈdä gôrˈyo͞o [key], 1734–99, Japanese astronomer who helped to introduce modern astronomical instruments and methods into Japan. Asada spent much of his career in the flourishi...

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 ...

Witelo of Silesia

(Encyclopedia)Witelo of Silesia or Vitelo, c.1230–75, Silesian physicist, philosopher, and theologian. He studied in Paris and Padua and spent time at the papal palace in Viterbo, Italy. His ten-volume work on op...

Copernican system

(Encyclopedia)Copernican system, first modern European theory of planetary motion that was heliocentric, i.e., that placed the sun motionless at the center of the solar system with all the planets, including the ea...

Salic law, laws of the Salian Franks

(Encyclopedia)Salic law: see Germanic laws.