If I were stranded on a desert island and could only have one astrology book - this is it! Have been using this cycle of houses in my life for over 15 years - it's amazing!
Robert Cole's "The Book of Houses" provides a unique and personalized system to really understand your natal chart. Out of print until recently, I have used Cole's book for years to help focus and manifest my personal goals, by utilizing the natural solar progression through my natal houses over the course of a year.
Cole provides an easy-to-use chart to calculate the dates of your natal houses. For instance, my "rising sign": occurs at 25 degrees Libra. According to Cole, this is equated with the day which occurs 25 degrees (or days) into the sign of Libra - or October 18th. Every year, this is the day when the Sun crosses into my 1st house & spends approximately 30 days there. Working with the solar progression as a process of "bringing to light", I would spend this time focused on "1st house issues".
Assigning 365 days on the 360-degree circle of a natal chart is easy, when Cole provides you with the key. His system allows you to spend approximately one month per year in each of the 12 houses, working to bring to fruition a set of goals you chose on the appropriate day.
Actually, I have blended Cole's system with the annual choosing of a tarot card to create an integrated and personalized magickal pattern of self-actualization, which I have taught to others.
Cole's book is fun to work with and each individual's house-seed system is unique unto themselves. You do, however, need to have an accurate natal chart to use the book since it does not provide you with one.