Spherical geometry is the geometry of the two-dimensional surface of a sphere. It is an example of a geometry which is not Euclidean. Two practical applications of the principles of spherical geometry are to navigation and astronomy. In plane geometry the basic concepts are points and (straight) lines. On the sphere, points are defined in the usua...
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http://en.wikipedia.org/wiki/Spherical_geometry
(from the article `mathematics`) ...away from the pure forms of constructive geometry toward areas related to the applied disciplines, in particular to astronomy. The necessary ... From early times, people noticed that the shortest distance between two points on Earth were great circle routes. For example, the Greek astronomer ... [2...
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http://www.britannica.com/eb/a-z/s/139
[
n] - the geometry of figures on the surface of a sphere
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http://www.webdictionary.co.uk/definition.php?query=spherical%20geometry
noun the geometry of figures on the surface of a sphere
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https://www.encyclo.co.uk/local/20974
a type of non-Euclidean (elliptic) geometry using the two-dimensional surface of a sphere, where a curved geodesic (not a straight line) is the shortest paths between points
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https://www.storyofmathematics.com/glossary.html
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