Narada Purana (Jyotisha Selections) · by Vyasa
Chapter 8 · Marriage
विवाहः
अंत्यांशास्तेपि शुभदा यदि वर्गोत्तमाह्वयाः ।अन्ये नवांशा न ग्राह्या यतस्ते कुनवांशकाः ॥ ४७६ ॥
In the full Narada Purana (Purva Bhaga) this is chapter 56, verse 476.
The last navamshas give good results too, if they are vargottama (same sign in the chart and its navamsha). Do not take the other navamshas, because they are bad navamshas.
Simple meaning: Last navamshas are good only if the same sign shows in the chart and navamsha. Others are bad.
कुनवांशकलग्नं यत्त्याज्यं सर्वगुणान्वितम् ।
Avoid a lagna in a bad navamsha, and avoid a day with a great fall-point fault.
अपि सर्वगुणोपेतं दम्पत्योर्मृत्युदं यतः ।
Such a day may put the couple's life at risk. Lightning, mist and rain are small faults.
प्रत्यर्कपरिवेषेंद्रचापांबुधरगर्जनाः ।
A false sun, halo, rainbow, thunder and some named faults and days are bad for weddings.