Narada Purana (Jyotisha Selections) · by Vyasa
Chapter 8 · Marriage
विवाहः
योगश्चतुर्गुणः पञ्चगुणं तिथ्यर्द्धसंज्ञितम् ।ततो मुहूर्तो बलवांस्ततो लग्नं बलाधिकम् ॥ ४३० ॥
In the full Narada Purana (Purva Bhaga) this is chapter 56, verse 430.
Yoga (Sun-Moon yoga of the almanac) counts four. The karana (half of a moon day) counts five. Then the muhurta (48 minutes) is stronger. Then the lagna (rising sign) is stronger still.
Simple meaning: 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.
चंद्रार्केज्यादयः पच यस्य राशेस्तु खेचराः ।
A lagna is good when the Moon, Sun, Jupiter and the others help it.