For a scientific or historical purpose, nowadays astronomers may need to use documents of the past. On can assume they are then, in a situation similar to the one that next centuries searchers will have to face, when using present time documents we will have left them. So, actual experience may help to know what to do or what not to do, dealing with the contents of future archives.
In astronomy, the most important variable is time. Since in this field, no experiment can be made, the astronomers must watch the universe and an essential task is to observe. Starting from observations, they will set up theories through analysis, treatment, interpretation, or else, starting from theoritical work, they will check their conclusions by comparison with observational data.