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Vasari, Giorgio

(Encyclopedia)Vasari, Giorgio jôrˈjō väzäˈrē [key], 1511–74, Italian architect, writer, and painter. He is best known for his entertaining biographies of artists, Vite de' più eccellenti architetti, pitto...

United States Air Force Academy

(Encyclopedia)United States Air Force Academy, at Colorado Springs, Colo.; for training young men and women to be officers in the U.S. air force; authorized in 1954 by Congress. Temporary quarters were opened at th...

Quechua

(Encyclopedia)Quechua, Kechua kēchˈwä [key], linguistic family belonging to the Andean branch of the Andean-Equatorial stock of Native American languages (mainly in South America). Encompassing far more native ...

sawmill

(Encyclopedia)sawmill, installation or facility in which cut logs are sawed into standard-sized boards and timbers. The saws used in such an installation are generally of three types: the circular saw, which consis...

horology

(Encyclopedia)horology hōrŏlˈəjē [key], science of measuring time and technology of constructing instruments for its measurement or recording. Early measurements of the passage of time were based on observatio...

concrete

(Encyclopedia)concrete, structural masonry material made by mixing broken stone or gravel with sand, cement, and water and allowing the mixture to harden into a solid mass. The cement is the chemically active eleme...

Great Depression

(Encyclopedia)Great Depression, in U.S. history, the severe economic crisis generally considered to have been precipitated by the U.S. stock-market crash of 1929. Although it shared the basic characteristics of oth...

Kennedy, Robert Francis

(Encyclopedia)Kennedy, Robert Francis, 1925–68, American politician, U.S. Attorney General (1961–64), b. Brookline, Mass., younger brother of President John F. Kennedy and son of Joseph P. Kennedy. A graduate o...

sidereal year

(Encyclopedia)sidereal year, time required for the earth to complete an orbit of the sun relative to the stars. The sidereal year is 365 days, 6 hr, 9 min, 9.5 sec of mean solar time (see solar time). It is 20 min ...

day

(Encyclopedia)day, period of time for the earth to rotate once on its axis. The ordinary day, or solar day, is measured relative to the sun, being the time between successive passages of the sun over a stationary o...