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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