Narada Purana (Jyotisha Selections) · by Vyasa
Chapter 8 · Marriage
विवाहः
लग्नं विवर्जयेद्यत्नात्तदंशांशतदीश्वराम् ।दंपत्योर्द्वादशं लग्नं राशिर्वा यदि लग्नगः ॥ ४६२ ॥
In the full Narada Purana (Purva Bhaga) this is chapter 56, verse 462.
Even so, avoid that lagna (rising sign) with care, with its navamsha (one-ninth part of a sign) and their lords. Next, say the 12th from the couple's lagna or sign is rising.
Simple meaning: Avoid that lagna, its navamsha and their lords. The 12th from their lagna or sign rising is next.
अर्थहानिस्तयोरस्मात्तदंशस्वामिनं त्यजेत् ।
That may bring loss of wealth, so leave out its navamsha lord too. The birth sign and birth lagna rising are good.
तयोरुपचयस्थानं लग्नेत्यंतशुभप्रदम् ।
A lagna in a growth house from the couple's signs is very good. A list of numbers begins.
वह्निचंद्रा रूपदस्राः खरामा व्योमबाहवः ।
Number list for the next eight stars: 13, 21, 30, 20, 32, 30, 20, 18.