Jyotiṣa-saṅgraha: Varga-vibhāga, Bala-nirṇaya, Garbha-phala, Āyuḥ-gaṇanā
एतद्योगजमायुः स्यादथ स्पष्टमुदीयते । सूर्याधिक बले पैंडं निसर्गाञ्च विधोर्बले ॥ ११९ ॥
etadyogajamāyuḥ syādatha spaṣṭamudīyate | sūryādhika bale paiṃḍaṃ nisargāñca vidhorbale || 119 ||
Inilah yang disebut usia yang lahir daripada gabungan (yogaja). Kini dinyatakan dengan jelas: apabila kekuatan Matahari lebih dominan, maka pakailah usia kiraan (paiṇḍa); dan apabila kekuatan Bulan lebih dominan, maka ambillah bahagian usia semula jadi (nisarga).
Narada (teaching in a technical/vedāṅga context, within the Narada–Sanatkumara dialogue frame)
Vrata: none
Primary Rasa: shanta
Secondary Rasa: none
It frames longevity as governed by cosmic order (graha-bala) and disciplined knowledge (śāstra), encouraging a dharmic life aligned with time (kāla) rather than fatalism.
Indirectly: by showing that life-span is variable and time-bound, it supports the Purāṇic emphasis on using one’s allotted time for sādhana—especially remembrance and devotion—rather than mere calculation.
Vedāṅga Jyotiṣa: assessing āyuḥ (longevity) through comparative strength (bala) of the Sun and Moon, and applying different lifespan measures (paiṇḍa vs. nisarga) accordingly.