Synopsis Determination of longevity is an integral of horoscopy. It is as different and complicated as it is important. The author, who is both a teacher and a practitioner of the science, has dealt with the whole subject in an easy to understand style for the beginner as well as the seasoned. Beginning with the elementaries he proceeds in sequence to the more and more difficult aspects of subject culminating ultimately in their synthesis. First he outlines the essential procedures for checking the correctness of time and date of birth for preparing the birth chart and then he goes on to the identification of inauspicious yogas has been logically explained. A deeper analysis of many methods of mathematical calculation of longevity and their application is enriched by practical examples.