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The kissing number of a sphere is 12. This led Fejes Tóth (1943) to conjecture that in any unit sphere packing, the volume of any Voronoi cell around any sphere is at least ...
The north pole is the point on a sphere with maximum z-coordinate for a given coordinate system. For a rotating sphere like the Earth, the natural coordinate system is ...
A cyclide formed by inversion of a standard torus when inversion sphere is tangent to the torus.
A parabolic cyclide formed by inversion of a horn torus when the inversion sphere is tangent to the torus.
A parabolic cyclide formed by inversion of a ring torus when the inversion sphere is tangent to the torus.
A parabolic cyclide formed by inversion of a spindle torus when the inversion sphere is tangent to the torus.
A parallelogram (parallelepiped) containing the minimum repeatable elements of a circle (sphere) packing.
A cylindrical projection of points on a unit sphere centered at O consists of extending the line OS for each point S until it intersects a cylinder tangent to the sphere at ...
The contact angle between a sphere and a tangent plane is the angle alpha between the normal to the sphere at the point of tangency and the basal plane with respect to which ...
The map which takes points on the surface of a sphere S^2 to their antipodal points.
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