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41Great-circle distance — The great circle distance is the shortest distance between any two points on the surface of a sphere measured along a path on the surface of the sphere (as opposed to going through the sphere s interior). Because spherical geometry is rather… …
42Mahalanobis distance — In statistics, Mahalanobis distance is a distance measure introduced by P. C. Mahalanobis in 1936.[1] It is based on correlations between variables by which different patterns can be identified and analyzed. It gauges similarity of an unknown… …
43Optimum HDTV viewing distance — is the distance that provides the viewer with the optimum immersive visual HDTV experience. Although opinions vary on the exact screen size to distance relationship, formal research and recommendations suggest closer is preferred to further[not… …
44Extragalactic distance scale — The extragalactic distance scale is a series of techniques used today by astronomers to determine the distance of cosmological bodies (beyond our own galaxy) not easily obtained with traditional methods. Some procedures utilize properties of… …
45The Great Cold Distance — The Great Cold Distance …
46long-distance paths and national trails — Walking, taking long walks in the countryside for pleasure, is a popular hobby in Britain, and many people go walking in national parks and other country areas at weekends. Walking is also called rambling (BrE) or hiking. Many routes go along… …
47Long-distance swimming — The distances that distinguish long distance swimming from ordinary swimming are those distances that are longer than are typically swum in pool competitions. When a given swim calls more on endurance than outright speed, the more likely it is to …
48Office of Distance Education — The Office of Distance Education (ODE) was founded in July 1998 on the campus of the Arkansas School for Mathematics, Sciences, and the Arts in Hot Springs, Arkansas and is now a part of the University of Arkansas System. Conceived as a way to… …
49Direct distance dialing — (DDD) or direct dial is a telecommunications term for a network provided service feature in which a call originator may, without operator assistance, call any other user outside the local calling area. DDD requires more digits in the number… …
50First long-distance telephone line — Infobox local1 name =World s First Long Distance Telephone Line chisl = yes caption = location= Pleasant Valley Road French Corral, California lat degrees = lat minutes = lat seconds = lat direction = long degrees = long minutes = long seconds =… …
