The World Geodetic System is a standard for use in cartography, geodesy, and navigation. It comprises a standard coordinate frame for the Earth, a standard spheroidal reference surface (the datum or reference ellipsoid) for raw altitude data, and a gravitational equipotential surface (the geoid) that defines the nominal sea level.
The latest revision is WGS 84 (dating from 1984 and last revised in 2004), which was valid up to about 2010. Earlier schemes included WGS 72, WGS 66, and WGS 60. WGS 84 is the reference coordinate system used by the Global Positioning System.
Read more about World Geodetic System: Main Parameters, History, The United States Department of Defense World Geodetic System 1966, The United States Department of Defense World Geodetic System 1972, A New World Geodetic System: WGS 84
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“Professor: War is hell, Mr. Thornhill, even if it’s just a cold one.
Roger Thornhill: If you fellows can’t lick the Vandamms of this world without asking girls like her to bed down with them, and fly away with them, and probably never come back, perhaps you ought to start learning how to lose a few cold wars.
Professor: I’m afraid we’re already doing that.”
—Ernest Lehman (b.1920)
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—Han Suyin (b. 1917)