Brihajjataka 4.11

4.11

oja ṛkṣe puruṣa aṃśakeṣu balibhir lagna arka gurv indubhiḥ puṃ janma pravadet sama aṃśaka gatair yugmeṣu tair yoṣitaḥ/
gurv arkau viṣame naraṃ śaśi sitau vakraś ca yugme striyaṃ/dvy aṅgastha budha vīkṣaṇāc ca yamalau kurvanti pakṣe svake//(śā vi)

When the ascendant, the Sun, Jupiter, and the Moon are strong in odd signs and in masculine navāṃśas, one should predict the birth of a male; when in even signs and even navāṃśas, of a female. / Jupiter and the Sun in an odd [sign produce] a male; the Moon, Venus, and Mars in an even [sign], a female; and through the aspect of Mercury situated in a dual sign, they produce twins in their respective half.