For those interested in learning more about Traditional Astrology, and Horary Astrology in particular, here are some resources:
The book Christian Astrology by William Lilly should function as your Bible — it is the most complete summary of Horary Astrology that exists, and it was written in the English language. It can be a little difficult to understand at times, but if you are armed with a basic understanding of the concepts of Horary Astrology (which you can obtain from a more recent author, such as Louis, Dunn, Barclay or Frawley) this should not be an obstacle. This book includes volumes 1 and 2
William Lilly also wrote a book on judging nativities, Christian Astrology Volume 3 .
Somewhat more accessible but less comprehensive are the works by modern authors, including Horary Astrology Rediscovered by Olivia Barclay.
Anthony Louis’ book Horary Astrology: the History and Practice of Astro-Divination is quite a comprehensive book, which includes a summary of important fixed stars and Arabic parts. He also wrote Horary Astrology Plain and Simple .
Barbara Dunn has written an excellent summary with many helpful images and charts, Horary Astrology Re-Examined .
THere is a short book by Derek Appleby entitled HOrary Astrology – The Art of Astrological Divination .
And then thre is Lee Lehman’s book, The Martial Art of Horary Astrology.