Agni Purana (Jyotisha Selections) · by Vyasa
Chapter 3 · Name Letters and Chakras
युद्धजयार्णवः (चक्राणि)
*मात्रा वै स्वरसंज्ञा स्यान्नाममध्ये क्षिपेत्प्रिये ।विंशत्या च हरेद्भागं यच्छेषं तत्फलं भवेत् ॥ १९ ॥
In the full Agni Purana this is chapter 132, verse 19.
The matra (vowel mark) is called by the vowel's name. Put it in the middle of the name, dear one. Divide by twenty. What is left is the result.
Simple meaning: Add the vowel to the name, divide by twenty, and read the result from the remainder.
उभयोर्नाममध्ये तु लक्षयेच्च धनं ह्यृणम् ।
Of two names, the one with fewer vowel marks is the debt and the one with more is the money.
धनेन मित्रता नृणामृणेनैव ह्युदास(सि)ता ।
In the Seva chakra, a money result means friendship and a debt result means coldness.
मेषमिथुनयोः प्रीतिर्मैत्री मिथुनसिंहयोः ।
Some pairs of signs are friendly: Aries and Gemini, Gemini and Leo, Libra and Leo, Sagittarius and Aquarius.