Agni Purana (Jyotisha Selections) · by Vyasa
Chapter 3 · Name Letters and Chakras
युद्धजयार्णवः (चक्राणि)
तिथयश्च रसा वेदा अग्निः सप्तदशाथ वा ।वसुरन्ध्राः समाख्याता अकटपानधो न्यसेत् ॥ १७ ॥
In the full Agni Purana this is chapter 131, verse 17.
Then 15, 6, 4, 3, or else 17; 8 and 9 are also named. Place the letters a, ka, ta and pa below.
Simple meaning: More numbers are listed for the columns, and four rows of letters go below them.
एकैकमक्षरं न्यस्त्वा(स्य) शेषाण्येवं क्रमान्न्यसेत् ।
Place the letters in order, add up the name, and divide the total by eight.
वायसान्मण्डलोऽत्युग्रो मण्डलाद्रासभो वरः ।
The remainders are ranked: crow, Mandala, ass, bull, elephant. Each one is stronger than the one before.
कुञ्जराच्च पुनः सिंहः सिंहाच्चैवं खरुर्वरः ।
Lion, then Kharu, then Dhumra are stronger still. This ranking shows which result is stronger or weaker.