Narada Purana (Jyotisha Selections) · by Vyasa
Chapter 2 · Signs, Planets, Birth
जातकम् १
क्रमः केंद्रादिकोऽत्रापि द्वित्र्यादौ सबलस्य च ।पाकपस्याब्धिनागाश्च ह्यर्णवा सहगस्य च ॥ १३९ ॥
In the full Narada Purana (Purva Bhaga) this is chapter 55, verse 139.
Here too the order starts with the corner houses. Among two or three, the strongest goes first. The multipliers: for the dasha (planet period) lord, 84; for the one with it, 42.
Simple meaning: The period lord's share is 84, a planet with it 42.
षड्वर्गार्द्धस्य त्रिंशस्य त्रिकोणगश्च स्मरगः ।
Planets share the sub-periods by their house from the period lord.
त्रिकोणस्थस्य चाष्टाक्षिसूर्या द्यूनगतस्य च ।
Planets in the luck houses, the 7th, and the 4th or 8th get their own shares.
दशागुणैर्हता भक्त्या गुणैक्येन समागताः ।
Periods are multiplied by their multipliers and divided to give years and months.