Agni Purana (Jyotisha Selections) · by Vyasa
Chapter 1 · Muhurta: Marriage, Home, Farming
ज्योतिःशास्त्रम्
ज्योतिःशास्त्रं प्रवक्ष्यामि शुभाशुभविवेकदम् ।चातुर्लक्षस्य सारं यत्तज्ज्ञात्वा सर्वविद्भवेत् ॥ १ ॥
In the full Agni Purana this is chapter 121, verse 1.
I will now explain jyotisha (astrology). It helps one tell good from bad. It is the essence of the four-lakh work. Knowing it, one comes to know all.
Simple meaning: This is the science of astrology. It teaches what is good and bad.
षट्काष्टके विवाहो न न च द्विर्द्वादशे स्त्रियाः ।
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.