Sun sign astrology is book material. Astrology is very complex so, to cover "great detail" in a book is a total fantasy. However this is a GREAT book to go as far as sun sign goes. I LOVE the expected gay humor and to-the-point nature of "Honey, you better listen up!". What I've discovered beyond the book, and in part, honorable mention to it, is that when you discover your six compatible signs, they can be either in the sun OR moon, which opens more opportunities for romance and love. This isn't a life-changing tomb or a deep exploration into the bowels of astrology. It also doesn't cost your first-born or a hand. So, click the link and buy the book, you cheap--