The exact time of death is actually very difficult to predict in astrology. But the time of death can be calculated (almost around) with reference to the planetary positions, the Dasha period and the Sub-Dasha period of the marakas. It should be borne in mind that the dasha of a maraka does not mean causing death or the dasha of a maleficent for a particular lagna that does not inflict death affects the health of a person. It simply means that during the course of these dashas one may experience certain obstacles, which may be the death or similar to the death of someone close or events that can change normal life.
Have you ever heard of medical astrology and how it can predict your death using your birth chart, horoscope and zodiac sign?.