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Narada Purana (Jyotisha Selections) · by Vyasa
Chapter 1 · Basics and Panchanga
ज्योतिषमूलं पञ्चाङ्गं च
अथोजपदगम्येंदोः क्रांतिर्विक्षेपसंस्कृता ।यदि स्यादधिका भानोः क्रांतेः पातो गतस्तदा ॥ १७७ ॥
In the full Narada Purana (Purva Bhaga) this is chapter 54, verse 177.
Then the Moon's declination, going by the odd quarter, is corrected by its latitude. If it is more than the Sun's declination, the fall point has already passed.
Simple meaning: 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.
शोध्यं चंद्राद्गते पाते तत्सूयगतिताडितम् ।
When the point has passed, take it off. Multiply by the Sun's motion and divide by the Moon's motion.