Agni Purana (Jyotisha Selections) · by Vyasa
Chapter 2 · War Astrology: Yogas, Nakshatras
युद्धजयार्णवः (योगाः नक्षत्राणि)
राहुरिन्द्रात्समीरं च वायोर्दक्षं यमाच्छिवम् ।शिवादाप्यं जलादग्निरग्नेः सौम्यं ततस्त्रयम् ॥ २१ ॥
In the full Agni Purana this is chapter 123, verse 21.
Rahu goes from the east to the north-west. From the north-west to the south. From the south to the north-east. From the north-east to the west. From the west to the south-east. From the south-east to the north. After that, he goes on by threes.
Simple meaning: Rahu moves through the directions, jumping three quarters at each step.
ततश्च संक्रमं हन्ति चतस्रो घटिका भ्रमन् ॥ २२ ॥
Rahu stays four ghatikas in each quarter and strikes when he changes over.
चण्डीन्द्राणी वाराही च मुशली गिरिकर्णिका ।
This lists herbs and plants to be carried.
यथालाभं धारयेत्ताः श्वेतार्कश्च शतावरी ।
Carry these herbs as you can get them, and they bring victory.