Agni Purana (Jyotisha Selections) · by Vyasa
Chapter 2 · War Astrology: Yogas, Nakshatras
युद्धजयार्णवः (योगाः नक्षत्राणि)
कोटचक्रं प्रवक्ष्यामि चतुरस्रं पुरं लिखेत् ।चतुरस्रं पुनर्मध्ये तन्मध्ये चतुरस्रकम् ॥ १ ॥
In the full Agni Purana this is chapter 128, verse 1.
I will tell the Kota chakra. Draw a square fort. Draw a square again in the middle, and a square in the middle of that.
Simple meaning: Draw a square fort, with a square inside it, and another inside that.
नाडीत्रितयचिह्नाढ्यं मेषाद्याः पूर्वदिङ्मुखाः ।
The fort figure has three lines. Krittika goes in the east and Ashlesha in the south-east.
भरणी दक्षिणे देया विशाखां नैर्ऋते न्यसेत् ।
Bharani goes in the south, Vishakha south-west, Anuradha west and Shravana north-west.
धनिष्ठां चोत्तरे न्यस्य ऐशान्यां रेवतीं तथा ।
Dhanishtha goes north and Revati north-east. These eight nakshatras form the outer line.