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by slightlycuban 4339 days ago
Setting up the projection is the most difficult part. Also one a lot of people have worked on, PROJ4 [http://trac.osgeo.org/proj/]

Were I to grab a projector and a hemisphere screen, I'd probably just reproject to azimuthal (or maybe even conformal), point the projector at the screen, and hope people don't pay too much attention to the very edge.