Agni Purana (Jyotisha Selections) · by Vyasa
Chapter 3 · Name Letters and Chakras
युद्धजयार्णवः (चक्राणि)
अमावास्यां वायवे च राहुः संमुखशत्रुहा ।काद्या जान्ताः संमुखे स्युर्साद्या दान्ताश्च दक्षिणे ॥ ११ ॥
In the full Agni Purana this is chapter 142, verse 11.
On the new moon, Rahu is in the north-west. He kills the enemy in front of him. The letters from ka to ja stand in front. The letters from jha to da stand on the right.
Simple meaning: At the new moon Rahu is in the north-west. The letters are split into groups by direction.
शुक्ले त्यजेत्कुजगुणान्धाद्या मान्ताश्च पूर्वतः ।
In the bright half, avoid certain things. Letters are set in the east and north. Avoid the look of the moon day.
पूर्वाश्च दक्षिणास्तिस्रो रेखा वै मूलभेदके ।
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.