The Great Epic of the Bhārata dynasty 6.3.31

6.3.31

māṃsavarṣaṃ punastīvramāsītkṛṣṇacaturdaśīm |
ardharātre mahāghoramatṛpyaṃstatra rākṣasāḥ || 31 ||

On the thirteenth day therefore, from the first lunation, according as it is the day of the full moon or the new moon, the moon and the sun are afflicted by Rahu. Such strange eclipses, both lunar and solar, forebode a great slaughter. All the quarters of the earth, being overwhelmed by showers of dust, look inauspicious. Fierce clouds, portentous of danger, drop bloody showers during the night. Rahu of fierce deeds is also, O monarch, afflicting the constellation Kirtika. Rough winds, portending fierce danger, are constantly blowing. All these beget a war characterised by many sad incidents. The constellations are divided into three classes. Upon one or another of each class, a planet of evil omen has shed its influence, foreboding terrible dangers. A lunar fortnight had hitherto consisted of fourteen days, or fifteen days (as usual), or sixteen days. This, however, I never knew that the day of new-moon would be on the thirteenth day from the first lunation, or the day of full-moon on the thirteenth day from the same. And yet in course of the same month both the Moon and the Sun have undergone eclipses on the thirteenth days from the day of the first lunation. The Sun and the Moon therefore, by undergoing eclipses on unusual days, will cause a great slaughter of the creatures of the earth. Indeed, Rakshasas, though drinking blood by mouthful, will yet not be satiated. The great rivers are flowing in opposite directions. The waters of rivers have become bloody.