the hall of astrology is connected to the observatory and is a generic academic hall for those who are curious about astrology or wish to pursue astrology as a side area of study.
astrological divination is a common form of practice used here.
this looks so good! I already want two chara's LOL xD
But wanted to say as I try to think, great job on your rules list- I think through it you're going to vet out a great community here :)