Agni Purana (Jyotisha Selections) · by Vyasa
Chapter 2 · War Astrology: Yogas, Nakshatras
युद्धजयार्णवः (योगाः नक्षत्राणि)
अशुभः सूर्यकुम्भः स्याच्छुभः पूर्वादिसंस्थितः ।फणिराहुं प्रवक्ष्यामि जयाजयविवेकदम् ॥ ५ ॥
In the full Agni Purana this is chapter 126, verse 5.
The Sun's pot is bad. The pots placed from the east on are good. Now I will tell the snake Rahu figure, which shows how to judge win and loss.
Simple meaning: The Sun's pot is bad, the pots from the east are good. A snake figure for win and loss follows.
अष्टाविंशाल्लिखे(?)द्बिन्दून्पुनर्भाज्यास्त्रिभिस्त्रिभिः ।
Draw twenty-eight dots, group them in threes, and draw lines for four nakshatras.
यस्मिन्नृक्षे स्थितो राहुस्तदृक्षं फणिमूर्धनि ।
Rahu's nakshatra goes on the snake's head. The other nakshatras follow in order, twenty-seven in all.
वक्त्रे सप्तगत ऋक्षे म्रियते सर्व आहवे ।
A star among the seven on the snake's mouth can mean death in battle; on the shoulder, defeat.