With this package you should find the BibTeX style file astron.bst and the complementary LaTeX style file astron.sty. You should install both on the computer on which you run LaTeX and BibTeX. Preferably you should put the files in the directory where the standard and/or optional LaTeX and BibTeX style files are kept. If you are on a multi-user system and have no permission to write to these directories, ask your system manager to install them for you. If you are the only astronomer on the system, and hence the only user of the `astron' style, you may also put the files in your working directory.