 | United States. Hydrographic Office - Aeronautical instruments - 1940 - 288 pages
...earth's surface by means of pilotage, dead reckoning, celestial observations, or radio aids. A sphere is a body bounded by a surface, all points of which are equally distant from a point within called the center (fig. 1). A great circle is a circle on the surface of the earth, the plane of which passes... | |
 | United States. Department of the Army - Map drawing - 1962 - 156 pages
...— A stereoscopic model. (See also Stereoscopic model.) Sphere — A body of space bounded by one surface, all points of which are equally distant from a point within called its center. Stereoscopy — The science and art which deal with stereoscopic effects and the methods... | |
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A sphere is a solid bounded by a surface all points of which are equally distant from a point within called the centre. 
