Narada Purana (Jyotisha Selections) · by Vyasa
Chapter 2 · Signs, Planets, Birth
जातकम् १
खयुगैरायुरंशाः स्युस्तत्संस्कारं वदामि ते ।ग्रहोनलग्नं षड्रात्यं चेत्संस्कारोऽन्यथा नहि ॥ १३० ॥
In the full Narada Purana (Purva Bhaga) this is chapter 55, verse 130.
by 40: these are the life degrees. I will tell you their correction. If the lagna (rising sign) minus the planet is less than six signs, make the correction. Otherwise do not.
Simple meaning: A correction is made only in a certain case.
तदंशः स्वाग्नयो भक्ता लब्धोनोभूर्गुणो भवेत् ।
A multiplier is worked out by dividing parts by thirty.
सौम्यस्यार्द्धेन पापस्य समग्रेणेति निश्चयः ।
A good planet is cut by half and a bad planet by the whole amount.
आयुरंशकलाभक्ताद्विंशत्याब्दा इनाहतम् ।
The lifespan in minutes is divided to give years, months and days.