Narada Purana (Jyotisha Selections) · by Vyasa
Chapter 2 · Signs, Planets, Birth
जातकम् १
द्व्यंगस्था बुधसंदृष्टाः स्वपक्षेय मलंकराः ।लग्नं विनौजभावस्थः सौरः पुंजन्मकृत्तथा ॥ ५३ ॥
In the full Narada Purana (Purva Bhaga) this is chapter 55, verse 53.
Planets in dual signs, seen by Mercury, make twins of their own kind. Saturn in an odd house other than the lagna (rising sign) also gives a boy.
Simple meaning: Planets in dual signs seen by Mercury can give twins. Saturn in an odd house away from the lagna gives a boy.
मिथो रवींदूर्ज्ञार्की वा पश्यतः समगं रविः ।
These sights and odd-even placements are conditions; the next verse gives the result, a neuter birth.
कुजेक्षितेपुमांशेदुहिता क्लीब जन्मदा ।
Some placements seen by Mars give a neuter birth. Venus and Moon in even signs begin a twin rule.
लग्नेंदुसमगौ युग्मस्थाने वा यमलंकराः ।
The lagna and the Moon in even signs can give twins.