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Narada Purana (Jyotisha Selections) · by Vyasa
Chapter 1 · Basics and Panchanga
ज्योतिषमूलं पञ्चाङ्गं च
भागयुक्तं च हीनं च व्ययनांशं तनुः कुजे ।प्राक्पश्चान्नतनाडीभ्यस्तद्वल्लंकोदयासुभिः ॥ १५१ ॥
In the full Narada Purana (Purva Bhaga) this is chapter 54, verse 151.
Add these degrees, or take them off for the reverse count. Remove the ayanamsha (equinox shift). That is the lagna (rising sign) on the horizon. From the east or west hour-angle ghatikas (24-minute unit), work the same way with the Lanka asus (4-second units).
Simple meaning: Add or take off the degrees and remove the equinox shift to get the rising sign.
भानौ क्षयधने कृत्वा मध्यलग्नं तदा भवेत् ।
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.