"There's no reason why, with a little care and attention, an answer should not be found somewhere amongst the twelve houses of heaven."
Horary astrology (also called interrogational) is a branch of astrology that focuses on answering questions. While this can be accomplished with natal astrology, horary offers a much more precise and accurate tool that is capable of distinguishing individual circumstances from larger lifelong themes. In other words, natal astrology will indicate what type of career you should or will have, but horary astrology will tell you if you'll obtain a specific position you have your sights on.
In no other branch is the divine nature of astrology emphasized so much as it is in horary. This is language that is missing in many modern books on the subject which seek to mechanize or systematize astrology in general. Medieval authors put a great emphasis on the soul and its process of contacting the divine through meaningful and personal questions. This sincerity would illicit a response from the divine in the form of an astrological chart that was not only descriptive of the situation, but would also allow the astrologer to discover the likely outcome of the question as well as provide guidance to the individual who asked it.
Horary charts are cast for the moment an astrologer understands or otherwise accepts a question. This lack of a concrete manifestation (such as the initiation of an event or the birth of a child) would cause horary to be looked down upon as superstitious in the Renaissance era. This attitude continues to the present day where it is often dismissed as "fortune telling".
Though dismissed by many, horary has never truly been defeated. The ability to answer precise questions and guide people through specific situations continues to be attractive to those who seek a more practical form of astrology.
Horary is an excellent place for a student to begin applying the basic concepts and techniques they've learned. Since a horary chart is only about a specific circumstance, it fine tunes the student's focus and allows them to zero-in on the specifics, but horary also manifests the symbolism of the art beautifully and literally. Exercising this focus allows the student to practice their interpretations at a one-thing-at-a-time pace which facilitates deeper understanding of the various symbols in a chart. This also sets a good foundation for mastering other branches of the art.