Many a sciences have attempted to predict the life span of a human being, but have   conceded that an accurate assessment of life span is not only a difficult proposition, but   also arguably, is impossible. This has been a dark area in the field of astrology as well. Is   human life subject to the whims of Shiva, or is there a measurable method to His will?   Everyday, we come across cases that are baffling, like the case of twins where the basic   birth chart does not change much except by a few degrees of ascendant, but one twin only   lives for a short period, while the second lives on to a ripe old age. How can one foresee   this? The book provides a simple astrological method to assess the life span of human life   and predict the longevity block of a subject in terms of – short, medium or a full life. This   is equally applicable to the charts of twins. The timing of demise is then calculated by   using the Nirayana Shoola Dasha.