Three lunation's, meeting twice or thrice in one and the same fortnight and on the thirteenth day, therefore, from the first luxation, according as it is the day of the fullmoon or the new-moon, the moon and the sun are devoured by Rahu. This forebodes a great slaughter (of creatures).
चन्द्रादित्यावुभौ ग्रस्तावेकाह्रा हि त्रयोदशीम्। अपर्वणि ग्रहं यातौ प्रजासंक्षयमिच्छतः॥