Do you need to visualize where various satellites are? It’s easy – just install the SaVi!
It compiles almost out of the box on IRIX (one have to edit some Makefiles) – see this Nekochan.net thread for details. By the way, the support from the SaVi maintainer ix excellent.
And did I mentioned that it also runs on the Mac OS X and on the Win32 (with Cygwin)?
You will also need to install (or compile) the GeomView software if you wish to see interactive 3D Earth image…