The Naisargik Ayu method is used when the Moon is stronger than both the Sun and Ascendant in a birth chart. It reflects the natural vitality granted by each planet at its point of deep exaltation. Unlike Pindayu, which uses planetary arcs, Naisargik Ayu assigns fixed lifespan values to each planet and adjusts them based on dignity and affliction.
This method is ideal for charts where mental strength (Moon) dominates physical or solar vitality. The Haran (deduction) rules are the same as in Pindayu, including reductions for combustion, inimical signs, and above-horizon placements.