See: Description
Class  Description 

Circle 
This class represents an oriented great circle on the 2sphere.

Edge 
Spherical polygons boundary edge.

S2Point 
This class represents a point on the 2sphere.

Sphere2D 
This class implements a twodimensional sphere (i.e.

SphericalPolygonsSet 
This class represents a region on the 2sphere: a set of spherical polygons.

SubCircle 
This class represents a subhyperplane for
Circle . 
Vertex 
Spherical polygons boundary vertex.

This package provides basic geometry components on the 2sphere.
We use here the topologists definition of the 2sphere (see Sphere on MathWorld), i.e. the 2sphere is the twodimensional surface defined in 3D as x^{2}+y^{2}+z^{2}=1.
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