Jatakaparijata 14.4

14.4

atha piṇḍāyuṣaḥ spaṣṭīkaraṇavidhiḥ |
nijoścaśuddhaḥ khacaro viśodhyoḥ bhamaṇaḍalāt ṣaḍbhavanonakaścet |
yathāsthitaḥ ṣaḍbhavanādhikaścellīkṛtaḥ saṅguṇito nijābdaiḥ ||

Now, the method of rectification for piṇḍa longevity: / A planet is deducted from its own exaltation; if less than six signs, it is subtracted from the zodiacal circle; / if greater than six signs, it remains as it is; reduced to minutes and multiplied by its own years,