Narada Purana (Jyotisha Selections) · by Vyasa
Chapter 8 · Marriage
विवाहः
गंडांतं कर्तरी रिष्फषडष्टेन्दुगतो ग्रहः ।दंपत्योरष्टमं लग्नं राशिर्विषघटी तथा ॥ ४३७ ॥
In the full Narada Purana (Purva Bhaga) this is chapter 56, verse 437.
Gandanta (the edge-point between signs) and kartari (scissors fault). The Moon in the 12th, 6th or 8th. A lagna (rising sign) or sign that is the 8th from the couple's birth lagna or birth sign. The poison ghatika (24-minute unit).
Simple meaning: More faults: gandanta, kartari, the Moon in the 6th, 8th or 12th, the 8th sign, and poison time.
दुर्मुहूर्तो वारदोषः खार्जूरिकसमाङ्घ्रिभम् ।
More faults: a bad hour, a bad weekday, and stars spoiled by line, eclipse or bad planets.
कुनवांशो महापातो वैधृतिश्चैकविंशतिः ।
The last faults are a bad navamsha, Mahapata and Vaidhriti. The five almanac parts come next.
पंचांगमस्य शुद्धिस्तु पंचांगशुद्धिरीरिता ।
A lagna with a fault in any almanac part is worth nothing.