To the ancient astrological literature of the Hindus traced to Sage Parasara there belong a certain number of complementary works without whose assistance, the student of astrology may not be able to understand the deeper implications of the subject. Prasna Marga may be considered as one such work. It is an exhaustive treatise on the various aspects of Prasna or Horary astrology. The authorship of the work is attributed to a Namboodiri Brahmin of Kerala, written in Kollam 825 (1649 AD) in a place called Edakad near Talasseri. It appears that at that time our author had an opponent by name Easwara Deekshita living in Chola country. Another great disciple of the author was Mochhattiloyit, a well-known personality in Kerala in those days. Kerala Varma was also a great astrologer. Kerala Varmaís disciple Punnasseri Nambi Neela- kanta Sarma wrote a commentary in Sanskrit. And in rendering the work into English reliance has been placed on this commentary. Unfortunately the Sanskrit commentary is available only for the first part consisting of sixteen chapters. Prasna Marga is a unique work on astrology, natal and horary, of vital importance to every astrological scholar, practitioner and student. The author, a Nambudari Brahmin of Kerala who wrote this book in 1650 A.D., was a renowned scholar and has culled valuable information from a number of ancient sources. This ancient work, and English translation of which is presented here in simple and elegant English interspersed with copious notes incorporating the author's own experiences, touches on some of the most important aspects of life marriage, children, longevity, death, disease, etc. Part 1 is an exhaustive treatise on the various aspects of predictive astrology of immense practical utility, which deals not only with the various aspects of Prasna or Horary Astrology, but also with almost the entire range of the forecasting art-Jataka or predictive astrology, Muhurta or electional astrology, Parihara or remedial astrology and Nimittas or the science of indications (Omens). Part II, is an encyclopaedic work on matters that affect all areas of human life, such as marriage, childre, causes of diseases as given in karma vipaka and the remedies, matters relating to deities, rulers, war, natural calamities, travel, rainfall, digging wells, details for finding underground water, theft cases, dreams and their interpretation as indicators for death of disease and its timings, etc.