Prastāra–Naṣṭa Procedures and Enumeration of Chandas
Laghu–Guru Computation
लगसंख्या वृत्तसंख्या चाद्याङ्गुलमथोर्ध्वतः / संख्यैव द्विगुणैकोनाच्छन्दः सारो ऽयमीरितः
lagasaṃkhyā vṛttasaṃkhyā cādyāṅgulamathordhvataḥ / saṃkhyaiva dviguṇaikonācchandaḥ sāro 'yamīritaḥ
முதல் அங்குல அளவிலிருந்து மேலே செல்லும் லகக் கணக்கும் வ்ருத்தக் கணக்கும்—அந்த எண்ணை இரட்டிப்பாக்கி ஒன்றைக் குறைத்தால், இதுவே சந்தஸின் சார விதி என அறிவிக்கப்படுகிறது।
Lord Vishnu (in instruction to Garuda/Vinata-putra, within the Brahma Kanda’s didactic sections)
Concept: Prosodic enumeration: counts of lagas and vṛttas derived by a doubling-minus-one rule across measures.
Vedantic Theme: Śabda-brahma orientation: disciplined sound/measure as a support for sacred knowledge; order in speech mirrors order in mind.
Application: For metrical cataloging: starting from the first unit and moving upward, compute total patterns by ‘2n−1’ (doubling then subtracting one) as the stated chandas-sāra rule; apply to generate/verify meter counts.
Primary Rasa: shanta
Secondary Rasa: adbhuta
Related Themes: Garuda Purana 1.212 surrounding verses: prastāra/uddiṣṭa/naṣṭa-like computational rules for chandas
This verse treats chandas as a technical discipline: correct metrical knowledge preserves accurate recitation and transmission of Purāṇic teaching.
It gives a compact computational rule: take the relevant count (of metrical groupings/meters), double it, and subtract one—presented as the ‘essence’ for chandas determination in this context.
Use it as a mnemonic when studying Sanskrit meters: disciplined counting and rule-based verification help keep chanting and textual study precise.