Saravali 34.34.28

34.34.28

kṣetraja putra prāpti yoga jñāna
saurarkṣe sauragaṇo budhadṛṣṭo gurukujārkadṛgdhīnaḥ |
kṣetrajaputraṃ janayati baudho'pi gaṇo ravijadṛṣṭaḥ ||

Knowledge of the combination for obtaining a kṣetraja son:
In a sign of Saturn, a division of Saturn aspected by Mercury, devoid of the aspect of Jupiter, Mars, and the Sun,
produces a kṣetraja son; likewise a division of Mercury aspected by the son of the Sun.