Agni Purana (Jyotisha Selections) · by Vyasa
Chapter 3 · Name Letters and Chakras
युद्धजयार्णवः (चक्राणि)
पूर्वाश्च दक्षिणास्तिस्रो रेखा वै मूलभेदके ।सूर्यराश्यादि संलिख्य दृष्टौ हानिर्जयोऽन्यथा ॥ १३ ॥
In the full Agni Purana this is chapter 142, verse 13.
Draw three lines going east and three going south. This is for splitting the root. Write the signs from the Sun's sign onward. If the look falls there, there is loss. Otherwise, victory.
Simple meaning: Draw three lines each way. Write the signs from the Sun's sign. Under the look, loss; otherwise victory.
विष्टिराहुं प्रवक्ष्यामि अष्टौ रेखास्तु पातयेत् ।
Vishti Rahu uses eight lines moving round the directions from the north-east to the south, north-west, east and west.
नैर्ऋताच्च नयेच्चन्द्रं चन्द्रादग्निं ततो जले ।
Rahu with Vishti goes round the directions from the south-west through the north and south-east to the west and north-east.
ऐशान्यां च तृतीयादौ सप्तम्यादौ च याम्यके ।
Rahu sits in different directions on different moon days. In the north-west he kills enemies.