Narada Purana (Jyotisha Selections) · by Vyasa
Chapter 8 · Marriage
विवाहः
विवाहादिषु कार्येषु नाड्यः षोडशषोडश ।षड्वर्गः शुभदः श्रेष्ठो विवाहस्थापनादिषु ॥ ४४४ ॥
In the full Narada Purana (Purva Bhaga) this is chapter 56, verse 444.
For marriage and such acts, drop sixteen ghatikas (24-minute unit) on each side. A good shadvarga (six divisions of a sign) is best for marriage, installing gods and such acts.
Simple meaning: Avoid 16 ghatikas on each side of the Sun's sign change. Use good six divisions for marriage.
भृगुषष्ठाह्वयो दोषो लग्नात्षष्ठगते सिते ।
Never use a lagna with Venus in the 6th, even if Venus is strong.
कुजोऽष्टमो महादोषो लग्नादष्टमगे कुजे ।
Mars in the 8th spoils a lagna, unless Mars is high and three good planets join the lagna.
पूर्णानंदाख्ययोस्तिथ्योः संधिर्नाडीद्वयं यदा ।
The meeting of Purna and Nanda moon days, two ghatikas long, is a risky junction for birth and marriage.