Ptolomy's "Tetrabiblos" (as most call it today) is the seminal work on western Astrology. It covers a tremendous area including nativities, astrology of events, and advanced matters of interpretation. The work has been one of the most influential works assembled in its day and had a wide-ranging impact on the later developments in Hellenistic times, among the Christian late middle ages, and the Islamic golden age as well.
This book is nicely typeset with facing page translation. The translation is clear and easy to read, but careful to preserve the original meanings and hence preserving more of Ptolomy's style than many readers might desire. The footnotes are generally helpful and the introduction places much in context.
Anyone interested in studying the Hellenistic world, Astrology, or the Classics will want to get this book. Highly recommended.