Narada Purana (Jyotisha Selections) · by Vyasa
Chapter 8 · Marriage
विवाहः
चंद्रताराबलं वीक्ष्य ततः पंचांगजं बलम् ।तिथिरेकगुणा वारो द्विगुणस्त्रिगुणं च भम् ॥ ४२९ ॥
In the full Narada Purana (Purva Bhaga) this is chapter 56, verse 429.
Look at the strength of the Moon and tara (star count from the birth nakshatra). Then the strength from the panchanga (almanac). The moon day counts one, the weekday two and the star three.
Simple meaning: Check the Moon and star strength, then the almanac parts, which count one, two and three.
योगश्चतुर्गुणः पञ्चगुणं तिथ्यर्द्धसंज्ञितम् ।
Each part counts more in turn: yoga four, karana five, then the hour and the lagna.
ततो बलवती होरा द्रेष्काणो बलवांस्ततः ।
The finer parts of the sign grow stronger in turn: hora, drekkana, navamsha, then dvadashamsha.
त्रिंशांशो बलवांस्तस्माद्वीक्ष्यमेतद्बलाबलम् ।
The thirtieth part is strongest. All signs are good for marriage if good planets join or see them.