Agni Purana (Jyotisha Selections) · by Vyasa
Chapter 1 · Muhurta: Marriage, Home, Farming
ज्योतिःशास्त्रम्
षट्काष्टके विवाहो न न च द्विर्द्वादशे स्त्रियाः ।न त्रिकोणे ह्यथ प्रीतिः शेषे च समसप्तके ॥ २ ॥
In the full Agni Purana this is chapter 121, verse 2.
Marriage is not for signs 6th and 8th from each other. Nor, for the woman, 2nd and 12th. Nor in the trikona (luck house) relation, 5th and 9th. But there is harmony in the rest, and in the mutual 7th.
Simple meaning: Marriage is not good if the two signs are 6-8, 2-12 or 5-9 apart. Other relations, and 7-7, are good.
द्विर्द्वादशे त्रिकोणे च मैत्री क्षेत्रपयोर्यदि ।
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.