Narada Purana — Purva Bhaga, Shloka 49
Jyotiṣa-śāstra Saṅgraha: Threefold Division, Gaṇita Methods, Muhūrta, and Planetary Reckoning
चापोननिघ्नः परिधिः प्रगङ्लः परिधेः कृते । तुर्यांशेन शरध्नेनाघेनिनाधं चतुर्गणम् ॥ ४९ ॥
cāponanighnaḥ paridhiḥ pragaṅlaḥ paridheḥ kṛte | turyāṃśena śaradhnenāgheninādhaṃ caturgaṇam || 49 ||
வியாசத்தை நிர்ணயிக்கப்பட்ட குணகத்தால் பெருக்கினால் பரிதி (சுற்றளவு) கிடைக்கும். பரிதி கணக்கில் கூறிய விதிப்படி நான்கில் ஒரு பகுதி திருத்தத்தைச் செய்து நான்குமடங்கு முறையில் கணிக்க வேண்டும்.
Sanatkumara (teaching Narada in a technical/śāstric mode within Mokṣa-dharma context)
Vrata: none
Primary Rasa: shanta
Secondary Rasa: adbhuta
FAQs
It highlights that dharmic life (and the pursuit of mokṣa) is supported by śāstric precision—accurate measures and correct procedures are part of disciplined living, not separate from spirituality.
Indirectly: it shows that devotion is strengthened when worship and observances are performed with proper knowledge and exactness, aligning practice with śāstra rather than guesswork.
A computational/measurement rule akin to Vedāṅga Jyotiṣa and traditional gaṇita—using coefficients and stepwise operations (caturgaṇa) to derive values like circumference for practical applications.