Narada Purana (Jyotisha Selections) · by Vyasa
Chapter 8 · Marriage
विवाहः
आरभ्योद्वाहदिवसात् षष्ठे वाप्यष्टमे दिने ।वधूप्रवेश संपत्त्यैदशमे सप्तमे दिने ॥ ५२२ ॥
In the full Narada Purana (Purva Bhaga) this is chapter 56, verse 522.
Count from the wedding day. The bride enters the new home on the 6th or 8th day. Or, for good fortune, on the 10th or 7th day.
Simple meaning: The bride enters the new home on the 6th, 8th, 10th or 7th day after the wedding.
आत्मानं संध्ययोर्हंति नास्ति गंडे विपर्ययः ।
A twilight birth may risk the child's own life. A Moola birth may risk the father-in-law's life.
तदंत्यपादजो नैव तथाश्लेषाद्यपादजः ।
A boy born in Jyeshtha's last quarter may put an elder sibling at risk. Mula's last quarter does not.
हायनद्वितयं जन्मभलग्नदिवसानपि ।
Skip two years and the birth star and lagna days. The wedding journey is then good, even with Venus set.