Henock 72:21-22 (from the Ethiopian text, numbering by R.H Charles)
21. And the sun rises from that portal and sets in the west, and returns to the east and rises thirty mornings in the third portal and sets in the west in the third portal. 22. And on that day the night becomes longer than the day, and night becomes longer than night, and day shorter than day till the thirtieth morning, and the night amounts exactly to ten parts and the day to eight parts.