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Mercury
Mercury is the planet nearest the Sun. Appropriately named for the wing-footed Roman messenger of the gods, Mercury whizzes around the Sun at a speed of 30 miles per second, completing one…Venus
Although Venus is Earth's closest neighbor, very little is known about the planet because it is permanently covered by thick clouds. In 1962, Soviet and American space probes, coupled with…Chinese examination system
(Encyclopedia) Chinese examination system, civil service recruitment method and educational system employed from the Han dynasty (206 b.c.–a.d. 220) until it was abolished by the Ch'ing dowager…free enterprise system
(Encyclopedia) free enterprise system: see capitalism.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…Global Positioning System
(Encyclopedia) Global Positioning System: see navigation satellite.horizon coordinate system
(Encyclopedia) horizon coordinate system: see altazimuth coordinate system.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…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…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…Trending
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