I'm reading RJ Stewart's book on Kabalah, The Miracle Tree. He doesn't use the Hebrew names in this book. He only calls them #th Emanation, and he introduces them with their planetary correspondence. I'm staring to see connections between the planets in astrology and the corresponding spheres. I'm really just a beginner, so I'm wondering if there is any good material exploring the astrology-Kabalah connection more in depth?