Ok, so responding to your first comment, the Bible still speaks figuratively and the firmament is usually just another name for the sky in the Bible. To the second, we have the same constellations year after year, but they are slowly changing. If you look closely between your choice of constellation today and that same one in the 1980s, you may be able to see a slight change. It's very difficult to see, but there is a very very slight change.