Jatakaparijata 13.21

13.21

ojarkṣe puruṣāṃśakeṣu balibhirlagnārkagurvindubhiḥ puñjanma pravadetsamāṃśakagatairyugmeṣu tayorṣitaḥ |
gurvarkau viṣame naraṃ śaśisitau vakraśca yugme striyam dvyāṅgasthā budhavīkṣaṇācca yamalau kurvanti pakṣe svake ||

One should declare a male birth when the ascendant, the Sun, Jupiter, and the Moon are strong in odd signs and in masculine navāṃśas; a female birth through their falling in even navāṃśas and in even signs;
Jupiter and the Sun in an odd sign produce a male; the Moon, Venus, and Mars in an even sign produce a female; and being in dual signs and aspected by Mercury, they produce twins in their own party.