Ephrem the Syrian : The springs of the abyss and the floodgates of heaven were open forty days and forty nights and "the ark was afloat for one hundred fifty days." But after one hundred fifty days the waters began to subside and the ark came to rest on Mt. Qardu. In the tenth month the tops of the mountains were seen. In the six hundred and first year, in the first month, the first day of the month, the waters were dried from off the earth. In the second month, that is, Iyor, "on the twenty-seventh day of the month, the earth was dry." Therefore Noah and those with him had been in the ark three hundred sixty-five days, for from the seventeenth of the second month, that is, Iyor, until the twenty-seventh of the same month the following year, according to the lunar reckoning, there were three hundred sixty-five days. Notice then that even the generation of the house of Noah employed this reckoning of three hundred sixty-five days in a year. Why then should you say that it was the Chaldeans and Egyptians who invented and developed it? — COMMENTARY ON Genesis 6.11.2-6.12.1