Agnipurana 123.13

123.13

rāhoemukhe tu bhaṅgaḥ syāditi rāhurudāhṛtaḥ /
viṣṭiragnau(3) paurṇamāsyāṃ karāṇīndre tṛtīyakaṃ //

In the mouth of Rāhu there would be defeat; thus Rāhu is declared.
Viṣṭi is in the southeast on the full moon; Karāṇī is the third in the east;