Agni Purana (Jyotisha Selections) · by Vyasa
Chapter 3 · Name Letters and Chakras
युद्धजयार्णवः (चक्राणि)
यस्मिन्नृक्षे स्थितः सूर्यः सौरिर्भौमस्तु सैंहिकः ।तस्मिन्स्थाने स्थिते विद्याद्धातमेव न संशयः ॥ १२ ॥
In the full Agni Purana this is chapter 131, verse 12.
On whichever star the Sun, Saturn, Mars or Rahu sits, know that the body part placed there is struck. There is no doubt.
Simple meaning: If the Sun, Saturn, Mars or Rahu sits on a star, the body part set on that star is hurt.
जयचक्रं प्रवक्ष्यामि आदिहान्तांश्च वै लिखेत् ।
A victory wheel is drawn with thirteen lines and six lines across. The letters from a to ha are written in it.
दिग्ग्रहा मुनयः सूर्या ऋत्विग्रुद्रस्तिथिः क्रमात् ।
Twelve numbers are set at the top of the wheel's columns, and letter rows go below them.
आदित्याद्याः सप्तकृते नामान्ते बलिनो ग्रहाः ।
Divide the name total by seven to find a planet. Sun, Saturn and Mars bring victory. Gentle planets bring peace.