Yes, that machine is still one of the analogue ones. New planetariums usually have a digital projector, but that one still had an old mechanical one. So all the stars and movements are done by gears and so on so going backwards or forwards is no problem at all. It gets less accurate the further you get away from the point to which it was build, but according to the people I met there it stays amazingly accurate within about 5000 years in any direction.
If you think about it any photo is a window in time and space. You look at a certain time and a certain location when you look at it. (well unless you mince the pixels through some photo editing, then it becomes fantasy)
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It's all pretty crazy when you stop and think about it all! Simply incredible. hahaha
