Narada Purana (Jyotisha Selections) · by Vyasa
Chapter 2 · Signs, Planets, Birth
जातकम् १
सपापगोऽर्को जायो वा परवीर्यप्रसूतिकृत् ।पापभस्थौ पापखेटैः सूर्यार्घानत्रिकोणगौ ॥ ७३ ॥
In the full Narada Purana (Purva Bhaga) this is chapter 55, verse 73.
Or the Sun is with a bad planet. That makes a birth from another man's seed. Two bad planets in bad signs may stand in the 7th, 9th or 5th from the Sun. (Our text is unclear here: a word in each line is damaged.)
Simple meaning: With these placements, the verse says the child may be from another man.
विदेशगः पितावृद्धः खेवा राशिवशात्यये ।
The father may be away or old. A full Moon in its own sign starts a rule for the place of birth.
द्यूनस्थे वा विधौ यातेंगना नारी प्रसूयते ।
A Moon in the 7th, or a watery Moon looking at a watery rising sign, sets up a birth by water.
स्वबंधलग्नगः सूतिः सलिले नात्र संसयः ।
A watery Moon points to birth near water. Saturn in the 12th, seen by bad planets, points to a hidden place.