Jyotiṣa-saṅgraha: Varga-vibhāga, Bala-nirṇaya, Garbha-phala, Āyuḥ-gaṇanā
द्विसप्तांशे च मासादिलग्रायुर्जायते स्फुटम् । अशायुषी सलग्नानां खेटानामंशका हृताः ॥ १२९ ॥
dvisaptāṃśe ca māsādilagrāyurjāyate sphuṭam | aśāyuṣī salagnānāṃ kheṭānāmaṃśakā hṛtāḥ || 129 ||
And in the Dvi-saptāṁśa (the 1/14th division), the longevity pertaining to the month and related factors, together with the ascendant (lagna), becomes clearly determined. For those ascendants that are ‘non-longevity-giving’ (aśāyuṣī), the planets’ allotted portions (aṁśa) are to be subtracted.
Sanatkumara (in instruction to Narada)
Vrata: none
Primary Rasa: shanta
Secondary Rasa: bhayanaka
It shows that the Purana preserves Vedanga knowledge (Jyotisha) as a dharmic tool—life’s duration is treated as a measurable karmic framework, encouraging timely pursuit of dharma and moksha.
Indirectly: by clarifying lifespan calculations, it urges a devotee to prioritize sadhana and remembrance of the Divine within the time available, rather than postponing spiritual practice.
Vedanga Jyotisha: using the Dvi-saptāṁśa divisional scheme to compute month/ascendant-based longevity and applying a correction rule—subtracting planetary portions when the ascendant is classified as aśāyuṣī.