Agni Purana (Jyotisha Selections) · by Vyasa
Chapter 3 · Name Letters and Chakras
युद्धजयार्णवः (चक्राणि)
प्रदक्षिणमकारादीन्स्वरान्पूर्वादितो लिखेत् ।चैत्राद्यं भ्रमणाच्चक्रं प्रतिपत्पूर्णिमा तिथिः ॥ १ ॥
In the full Agni Purana this is chapter 131, verse 1.
Write the vowels, starting with a, going clockwise from the east. The chakra goes round from Chaitra. The tithis (moon days) are the first and the full moon day,
Simple meaning: Write the vowels round a circle from the east. The months start from Chaitra. Moon days are listed next.
त्रयोदशी चतुर्दशी अष्टम्येका च सप्तमी ।
These moon days are listed. Twelve moon days are counted from the first to the thirteenth.
चैत्रचक्रे तु संस्पर्शाज्जयलाभादिकं विदुः ।
In this wheel, odd places bring good results like victory and gain. Even places bring bad results.
युद्धकाले समुत्पन्ने यस्य नाम ह्युदाहृतम् ।
When war begins, look at the person's name and where it sits in the wheel. The sentence ends in the next verse.