I have no Idea what I have to do here - I have 100% on the screen, my journal is fully ticked, I can't think of what i need to read?

Hi all, I thought I'd make a thread specifically for people to ask for help on puzzles and for you Goetia pros to answer! ;)

Just ask for it here, I don't like bots

CAn someone help me with the constellations puzzle? I am very dumb in regards to this kind of puzzles. I talked with the Ouija spirit, and he told me "ad astra". I guess this ad astra is the key to open the "constellation briefcase", which will give me the password to open the far right room. I am also stuck at more sections, but I think this is the most enigmatic to me, I will deal with the other ones eventually...

Just for fun, I kinda want to make my own sigil. But, at least that I saw, we only get an official key for about 11, and they are not the ones I'd need. Does anyone disagree with that? Or is this an alphabet that also exists outside the game universe? Obviously I'm just playing around, but this sounds really fun. :-)...