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Narada Purana (Jyotisha Selections) · by Vyasa
Chapter 1 · Basics and Panchanga
ज्योतिषमूलं पञ्चाङ्गं च
तद्वच्छशांकपातस्य फलं देयं विपर्ययात् ।कर्मैतदसकृत्तावत्क्रांती यावत्समेतयोः ॥ १८१ ॥
In the full Narada Purana (Purva Bhaga) this is chapter 54, verse 181.
In the same way the result for the Moon's fall point is given in reverse. This work is repeated until the two declinations come equal.
Simple meaning: Repeat the work until the Sun's and Moon's declinations are equal.
क्रांत्योः समत्वे पातोऽथ प्रक्षिप्तांशोनिते विधौ ।
When the declinations match, the point is reached. Compare with the midnight Moon to see if it passed.
स्थिरीकृतार्द्धरात्रार्द्धौ द्वयोर्विवरलिप्तकाः ।
The gap between the fixed Moon and the midnight Moon gives the time of the point.
रवींद्वोर्मानयोगार्द्धं षष्ट्या संगुण्य भाजयेत् ।
Half the sum of the Sun's and Moon's sizes, times 60, divided by the difference in motion, gives the half-duration.