Narada Purana — Purva Bhaga, Shloka 152
Jyotiṣa-śāstra Saṅgraha: Threefold Division, Gaṇita Methods, Muhūrta, and Planetary Reckoning
भानौ क्षयधने कृत्वा मध्यलग्नं तदा भवेत् । भोग्यासूनूनकस्याथ भुक्तासूनधिकस्य च ॥ १५२ ॥
bhānau kṣayadhane kṛtvā madhyalagnaṃ tadā bhavet | bhogyāsūnūnakasyātha bhuktāsūnadhikasya ca || 152 ||
太陽（バーヌ）が「クシャヤ」（減少）の宮に置かれるとき、そのとき「マディヤ・ラグナ」（中天のラグナ）を定めるべし。この規則は、未だ受けるべきプラーナが少ない場合にも、すでに費やされたプラーナが多い場合にも等しく当てはまる。
Sanatkumara (in instruction to Narada)
Vrata: none
Primary Rasa: shanta
Secondary Rasa: none
FAQs
It shows that even Moksha-oriented teaching includes precise Vedāṅga Jyotiṣa—right timing and correct calculation support disciplined dharma-practice, which in turn steadies the mind for liberation.
Indirectly: by emphasizing accurate sacred time-reckoning, it supports properly timed worship and observances—key supports for steady Viṣṇu-bhakti and regulated sādhana.
Vedāṅga Jyotiṣa: a procedural rule for computing madhya-lagna when the Sun is in a kṣaya condition, using measures of remaining vs. expended ‘asū/prāṇa’ units.