I think you are right. The TCGs do seem to show what the constellations will be, but I don't think we'll be able to get them until we do other stuff in the plot (eg. going to the tomb and clicking on the door etc.)
(As it seems that three of the TCGs have only 5 bright stars, four have 4 bright stars and the Siyana one has more than 6, so other information will probably be necessary)
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