Narada Purana (Jyotisha Selections) · by Vyasa
Chapter 2 · Signs, Planets, Birth
जातकम् १
हानिद्वयेऽधिकाः कार्या यदा क्रूरस्तनौ तदा ।विहायारीनंशाद्यैर्हन्यादायुर्लवान् भजेत् ॥ १२४ ॥
In the full Narada Purana (Purva Bhaga) this is chapter 55, verse 124.
When both cuts apply, make only the larger one. When a cruel planet is in the lagna (rising sign), drop the lagna's signs. Multiply the life years by its degrees and the rest. Then divide them (Our text is unclear here: 'viharin', read as 'dropping the signs'.)
Simple meaning: When two cuts apply, only the bigger one is made. A cruel planet rising also cuts the years.
भगणांशैर्लब्धहीनास्तेषां कार्या विचक्षणैः ।
The rising planet cuts the years by a share. A bad one cuts the whole, a good one half.
स्पष्टास्तेंशाः खषट्त्र्यासा गुणयित्वा स्वकैर्गणैः ।
Degree parts are turned into years and months by multiplication and division.
तच्छेषश्च त्रिगुणितः तेनैवाप्तं दिनानि च ।
The remainders are turned into days and smaller units.