How do I install Stellarium?
For Windows users, run the downloaded file “setup.exe” and follow the instructions. For Linux users, the easiest is to find a pre-compiled package for your distribution. But it is also possible to compile the program yourself: detailed compilation instructions for Linux, Posix, Cygwin and MacOSX are available in the “INSTALL” file. Mac OSX users should download the dmg file, double click on it to open, the application is contained inside, drag the application to your Applications folder.