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It's not so much a learning tool for learning astrology but a great book for anyone wanting to learn more about astrology's history.
I often use this book in my astrology classes to delve into the fascinating history of our favorite field.
Tester takes it from the very beginning -- the Greeks, not the Chaldeans as sometimes supposed -- and brings it right through the Middle Ages and the Age of Enlightenment. Chances are you've never heard astrology talked about this way. If you are a history buff, like me, it's just all that much more interesting. It's history the way you never heard it taught, too.
Tester's work is scholarly but readable and I found the information just fascinating.
Despite this, Tester discusses all the key figures in the history of Western astrology from the Hellenistic period through the Renaissance, and does so with depth and subtlety.
It should be added that this is a very scholarly treatment of the subject. Anyone seeking a popular history of the subject or anyone who actually believes in the validity of astrology is likely not to find this volume to their liking. But those who enjoy the works of authors like Frances Yates and Keith Thomas, this volume will prove to be of great interest.