Online Encyclopedia

GREAT CIRCLE

Online Encyclopedia
Originally appearing in Volume V12, Page 398 of the 1911 Encyclopedia Britannica.
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GREAT CIRCLE. The circle in which a sphere is cut by a plane is called a " great circle," when the cutting plane passes through the centre of sphere. Treating the earth as a sphere,the meridians of longitude are all great circles. Of the parallels of latitude, the equator only is a great circle. The shortest line joining any two points is an arc of a great circle. For " great circle sailing " see NAVIGATION.
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