See: Description
| Class | Description | 
|---|---|
| Circle | This class represents an oriented great circle on the 2-sphere. | 
| Edge | Spherical polygons boundary edge. | 
| S2Point | This class represents a point on the 2-sphere. | 
| Sphere2D | This class implements a two-dimensional sphere (i.e. | 
| SphericalPolygonsSet | This class represents a region on the 2-sphere: a set of spherical polygons. | 
| SubCircle | This class represents a sub-hyperplane for  Circle. | 
| Vertex | Spherical polygons boundary vertex. | 
This package provides basic geometry components on the 2-sphere.
We use here the topologists definition of the 2-sphere (see Sphere on MathWorld), i.e. the 2-sphere is the two-dimensional surface defined in 3D as x2+y2+z2=1.
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