The Lee conformal world in a tetrahedron is a polyhedral, conformal map projection that projects the globe onto a tetrahedron using Dixon elliptic functions.
Because of the nature of polyhedra, this map projection can be tessellated infinitely in the plane.
the latitude: where and sm and cm are Dixon elliptic functions.
Since there is no elementary expression for these functions, Lee suggests using the 28th-degree MacLaurin series.
Conformal Projections Based on Elliptic Functions.