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instrument-landing system

(Encyclopedia)CE5 Instrument-landing system (ILS), the most common instrument-landing approach system, uses two beams to guide an airplane. instrument-landing system (ILS), ground-based radio system designed to...

international monetary system

(Encyclopedia)international monetary system, rules and procedures by which different national currencies are exchanged for each other in world trade. Such a system is necessary to define a common standard of value ...

Independent Treasury System

(Encyclopedia)Independent Treasury System, in U.S. history, system for the retaining of government funds in the Treasury and its subtreasuries independently of the national banking and financial systems. In one for...

horizon coordinate system

(Encyclopedia)horizon coordinate system: see altazimuth coordinate system. ...

free enterprise system

(Encyclopedia)free enterprise system: see capitalism. ...

Global Positioning System

(Encyclopedia)Global Positioning System: see navigation satellite. ...

galactic coordinate system

(Encyclopedia)galactic coordinate system, astronomical coordinate system in which the principal axis is the galactic equator (the intersection of the plane of the Milky Way with the celestial sphere) and the refere...

equatorial coordinate system

(Encyclopedia)CE5 Equatorial coordinate system equatorial coordinate system, the most commonly used astronomical coordinate system for indicating the positions of stars or other celestial objects on the celesti...

National Forest System

(Encyclopedia)National Forest System, federally owned reserves, c.191 million acres (77.4 million hectares), administered by the Forest Service of the U.S. Dept. of Agriculture. The system is made up of 155 nationa...

autonomic nervous system

(Encyclopedia)autonomic nervous system: see nervous system. ...