Narada Purana (Jyotisha Selections) · by Vyasa
Chapter 2 · Signs, Planets, Birth
जातकम् १
द्विसप्तांशे च मासादिलग्नायुर्जायते स्फुटम् ।अंशायुषी सलग्नानां खेटानामंशका हताः ॥ १२९ ॥
In the full Narada Purana (Purva Bhaga) this is chapter 55, verse 129.
Divide again by 200, and the lagna (rising sign)'s life in months and the rest comes out exact. In the amshayu (lifespan by degree parts), multiply the degrees of the planets and of the lagna. (Our text is unclear here: 'dvisaptamshe', read as 'divided by 200'.)
Simple meaning: A step to find the rising sign's life in months, and to start the degree method.
खयुगैरायुरंशाः स्युस्तत्संस्कारं वदामि ते ।
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.