: Mathématiques: spherical circle

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spherical circle

In spherical geometry, a spherical circle (often shortened to circle) is the locus of points on a sphere at constant spherical distance (the spherical radius) from a given point on the sphere (the pole or spherical center). It is a curve of constant geodesic curvature relative to the sphere, analogous to a line or circle in the Euclidean plane; the curves analogous to straight lines are called great circles, and the curves analogous to planar circles are called small circles or lesser circles.
(Wikipedia, The Free Encyclopedia, https://en.wikipedia.org/wiki/Spherical_circle)

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