The Pranapada (the point of embodied life) is computed from the lagna and the Sun (Bhaskara) at the time of sankranti; it is the indicator of the native's life-force.
Verse 2 — Pranapada Sphuta from the Sun and Birth Time Units
sūryasphuṭayutaṁ yat tu ghaṭīnāḍīvikalpitam | rāśyāṁśavikalākhyena prāṇapādaṁ prakīrtitam ||
That which is added to the Sun's true longitude, reckoned from the elapsed ghatis and vinadis of birth time expressed as signs, degrees, and minutes, is proclaimed as the Pranapada sphuta.
Verse 3 — Verification of Pranapada against the Lagna