Agni Purana (Jyotisha Selections) · by Vyasa
Chapter 1 · Muhurta: Marriage, Home, Farming
ज्योतिःशास्त्रम्
द्विर्द्वादशे त्रिकोणे च मैत्री क्षेत्रपयोर्यदि ।भवेदेकाधिपत्यं च ताराप्रीतिरथापि वा ॥ ३ ॥
In the full Agni Purana this is chapter 121, verse 3.
Take a 2nd-12th or trikona (luck house) relation. Say the two sign lords are friends. Or both signs have one lord. Or the tara (star count from the birth nakshatra) agrees.
Simple meaning: A 2-12 or 5-9 sign match can still work if the sign lords are friends or the same.
तथाऽपि कार्यः संयोगो न तु षट्काष्टके पुनः ।
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.