pascal@debianx:~$ stellarium --help
Usage:
  stellarium [options]

Options:
--version (or -v)       : Print program name and version and exit.
--help (or -h)          : This cruft.
--config-file (or -c)   : Use an alternative name for the config file
--user-dir (or -u)      : Use an alternative user data directory
--verbose               : Even more diagnostic output in logfile 
                          (esp. multimedia handling)
--compat33 (or -C)      : Request OpenGL 3.3 Compatibility Profile
                          May help for certain driver configurations. Mac?
--fix-text (or -t)      : May fix text rendering problems
--dump-opengl-details (or -d) : dump information about OpenGL support to logfile.
                          Use this is you have graphics problems
                          and want to send a bug report
--full-screen (or -f)   : With argument "yes" or "no" over-rides
                          the full screen setting in the config file
--screenshot-dir        : Specify directory to save screenshots
--startup-script        : Specify name of startup script
--home-planet           : Specify observer planet (English name)
--altitude              : Specify observer altitude in meters
--longitude             : Specify longitude, e.g. +53d58\'16.65\"
--latitude              : Specify latitude, e.g. -1d4\'27.48\"
--list-landscapes       : Print a list of valid landscape IDs
--landscape             : Start using landscape whose ID (dir name)
                          is passed as parameter to option
--sky-date              : Specify sky date in format yyyymmdd
--sky-time              : Specify sky time in format hh:mm:ss
--fov                   : Specify the field of view (degrees)
--projection-type       : Specify projection type, e.g. stereographic
--restore-defaults      : Delete existing config.ini and use defaults
--multires-image        : With filename / URL argument, specify a
                          multi-resolution image to load