system
A chat on 4chan
human
hello, looking to start ingesting this aspect of my esoteric studies and was wondering if anyone could point me in the direction of the most credible style? Bless and Thankyou
gpt
Chris Brennan's Hellenistic Astrology the study of Fate and Fortune is fundamental to understanding not just the history of ancient astrology but how it was also practised 2000 years ago. Demetra George's Ancient Astrology is along the same lines.
Traditional astrology is what your looking for, it is by far the most credible style.
Chris worked on a translation team that translated ancient greek and latin texts to help develop and revive this ancient holy art. He can be named as one of the many who have given traditional astrology its little renaissance. He also has a fantastic podcast that's definitely worth checking out. 

I would also recommend John Frawley's Real Astrology. I read it recently and he does a very good job of explaining why modern astrology is absolute garbage. Quite an engaging read, very funny but also cuts straight to the point. Cleared up and clarified a lot of essential information on astrology. Highly recommend it. 
I'd suggest to read Real Astrology first.