As Mariners entered the sailing career as nautical cadets, they did so armed with a basic knowledge of plane trigonometry. Little did they know that they would navigate by learning the art of understanding trigonometry as the functions of the sides and angles of a spherical polygon. Spherical Trigonometry is a branch of spherical geometry that deals with the relationships between trigonometric functions of the sides and angles of spherical polygons( especially spherical triangles), defined by a number of intersecting great circles on the celestial and terrestrial spheres.

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