Agni Purana (Jyotisha Selections) · by Vyasa
Chapter 1 · Muhurta: Marriage, Home, Farming
ज्योतिःशास्त्रम्
तथाऽपि कार्यः संयोगो न तु षट्काष्टके पुनः ।जीवे भृगौ चास्तमिते म्रियते च पुमान्स्त्रियाः ॥
In the full Agni Purana this is chapter 121, verse 4.
Then the union may still be made. But never in the 6th-8th relation. If Jupiter or Venus is set, the woman's husband may die.
Simple meaning: A union can still be made, but never in a 6-8 match. A set Jupiter or Venus harms the husband.
गुरुक्षेत्रगते सूर्ये सूर्यक्षेत्रगते गुरौ ।
Marriage is not praised when Sun and Jupiter sit in each other's signs. The girl may be widowed.
चैत्रे पौषे न रिक्तासु हरौ सुप्ते कुजे रवौ ।
Some months, days and the dark Moon are not good for marriage. Twilight is good.
रोहिणी चोत्तरा मूलं स्वाती हस्तोऽथ रेवती ।
Marriage is praised under these stars, in Libra or Gemini.