For the first time since its inception in 1993, the Traditional Horary Course is in book form as a foundational text for students. It contains twenty lessons teaching the entire traditional system as it applies to horary astrology, the art of interrogations, for beginning and advanced students. Sue Ward explains the astrological system as it stood in the early modern period and as it was articulated by William Lilly (1602-1681) in his Christian Astrology. He studied widely and in great depth, and was the foremost astrologer of the mid-seventeenth century. His study of astrology was filtered through his wide practice and disseminated through his textbook and other writings. The result of his work is presented here through the lens of one of his students. This book is an encyclopaedic explanation of the techniques of William Lilly’s teaching and practice with lots of example charts, it is therefore an excellent reference work for all astrologers.