Narada Purana — Purva Bhaga, Shloka 84
Jyotiṣa-śāstra Saṅgraha: Threefold Division, Gaṇita Methods, Muhūrta, and Planetary Reckoning
तद्वर्गतो दशगुणात्पद भूपरिधिर्भवेत् । लंबज्याघ्नस्वजीवाप्तः स्फुटो भूपरिधिः स्वकः ॥ ८४ ॥
tadvargato daśaguṇātpada bhūparidhirbhavet | laṃbajyāghnasvajīvāptaḥ sphuṭo bhūparidhiḥ svakaḥ || 84 ||
उस मान के वर्ग का दस गुना करने से चरणबद्ध रूप से पृथ्वी की परिधि ज्ञात होती है। परन्तु यथार्थ परिधि लम्ब-ज्या से गुणा करके और अपनी जीव (ज्या) से भाग देने पर स्फुट रूप से प्राप्त होती है॥
Narada (teaching in a technical/astronomical context within Moksha-Dharma discourse)
Vrata: none
Primary Rasa: shanta
Secondary Rasa: adbhuta
FAQs
It shows that Narada Purana integrates dharma with disciplined knowledge—precision (sphuṭa) and correct method are themselves part of righteous learning that supports clarity of understanding.
Indirectly: it frames sacred study as orderly and exact, encouraging a devotee to approach Vishnu’s cosmos with reverence and intellectual honesty rather than guesswork.
Vedāṅga Jyotiṣa/gaṇita: the verse references jyā/jīva (sine) operations and distinguishes approximate versus accurate computations for determining bhū-paridhi (earth’s circumference).