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Narada Purana (Jyotisha Selections) · by Vyasa
Chapter 1 · Basics and Panchanga
ज्योतिषमूलं पञ्चाङ्गं च
भानौ क्षयधने कृत्वा मध्यलग्नं तदा भवेत् ।भोग्यासूनूनकस्याथ भुक्तासूनधिकस्य च ॥ १५२ ॥
In the full Narada Purana (Purva Bhaga) this is chapter 54, verse 152.
Take the result off the Sun, or add it to the Sun. Then you get the middle lagna (rising sign), the sign on the meridian. To find the time, take the yet-to-come asus (4-second units) of the smaller one. Take the gone asus of the larger one.
Simple meaning: Adjust the Sun to find the sign on the meridian. Then start the rule for finding the time.
सपिंड्यांतरलग्नासूनेवं स्यात्कालसाधनम् ।
Time comes from the rising times in between. If the Sun is within 14 degrees of Rahu's axis, the Moon is eclipsed.
एकायनगतौ स्यातां सूर्याचन्द्रमसौ यदा ।
When the Sun and Moon are on the same course and have equal declinations, Vaidhriti occurs.
विपटीतायनगतौ चंद्रार्कौ क्रांतिलिप्तिकाः ।
When the Sun and Moon are on opposite courses with equal declinations, Vyatipata occurs.