I've read a great many books (including my own) which offer an "overview" of astrology, but all of them give one author's point of view only. Phillipson's book offers 30+ perspectives (largely British) and presents them in a clear and unbiased manner, arranged by topic. I'm adding this book to the Recommended Reading List I pass out to all of my students in Client Centered Astrology, and I've made it a part of my own library.