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Narada Purana (Jyotisha Selections) · by Vyasa
Chapter 1 · Basics and Panchanga
ज्योतिषमूलं पञ्चाङ्गं च
भास्करेंद्वोर्भचक्रांतचक्रार्द्धावधिसंस्थयोः ।दृक्कल्पसाधितांशादियुक्तयोः स्वावपक्रमौ ॥ १७६ ॥
In the full Narada Purana (Purva Bhaga) this is chapter 54, verse 176.
Say the Sun and Moon stand near the end of the circle, or of half the circle. Their degrees are found to match what is seen. Find the declination of each.
Simple meaning: When the Sun and Moon together are near 360 or 180 degrees, find each one's declination.
अथोजपदगम्येंदोः क्रांतिर्विक्षेपसंस्कृता ।
Correct the Moon's declination by its latitude. If it is greater than the Sun's, the point has passed.
न्यूना चेत्स्यात्तदा भावी वामं युग्मपदस्य च ।
If it is less, the point is still to come. The even quarter works the other way.
क्रांत्योर्जेत्रिज्ययाभिस्ते परमायक्रमोद्धते ।
Turn both declinations into arcs and correct the Moon by their difference.