I'd say in regard to Astrology one is best served by starting at the beginning and first acknowledging what things were like back then, what the people didn't have and what they did have in it's entirety. Take what you need from that but it is relevant to this thread in various respects.Yes, astrology is "historical" (and hysterical) it's been around for centuries.. And? That lends it credence? What are you trying to say, Love?
We can consider the astrological constellations as relevant and helpful in defining a Global Earth, I'm not going into detail here now but suffice to say that there are two/three regions of the planet which make different and unique observations of those reference points in the sky. Those observations are helpful in determining the Globe.