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air navigation

(Encyclopedia)air navigation, science and technology of determining the position of an aircraft with respect to the surface of the earth and accurately maintaining a desired course (see navigation). Basic to air ...

air traffic control

(Encyclopedia)air traffic control, the system by which airplanes are safely routed into and out of major airports. Air traffic control in the United States is centered in a number of regional control centers that r...

French Academy

(Encyclopedia)French Academy (L'Académie française), learned society of France. It is one of the five societies of the Institut de France. The work of the French Academy has chiefly consisted of the preparation...

air

(Encyclopedia)air: see atmosphere; liquid air; ventilation. ...

Cocoa, city, United States

(Encyclopedia)Cocoa, city (2020 pop. 19,041), Brevard co., E Fla., on the Indian River (a lagoon), a segment of the Intracoastal Waterway; inc. 1895. It is a tourist ...

Senate, United States

(Encyclopedia)Senate, United States: see Congress of the United States. ...

Caribou, town, United States

(Encyclopedia)Caribou kârˈĭbo͞o [key], town (2020 pop. 7,396), Aroostook co., NE Maine, on the Aroostook ...

centripetal force and centrifugal force

(Encyclopedia)CE5 Centripetal and centrifugal forces: When a ball is swung in a circle at the end of a string, centripetal and centrifugal forces act as shown above. centripetal force and centrifugal force, act...

Montgomery, city, United States

(Encyclopedia)Montgomery, city (1990 pop. 187,106), state capital and seat of Montgomery co., E central Ala., near the head of navigation on the Alabama River just below the confluence of the Coosa and Tallapoosa r...

Pennsylvania Academy of the Fine Arts

(Encyclopedia)Pennsylvania Academy of the Fine Arts, Philadelphia, established in 1805, incorporated in 1806. It is supported by private endowment. The academy grew out of a proposal by Charles Willson Peale for an...