There were other changes among the celestial spheres during the year of the flood. All the time it lasted, the sun and the moon shed no light, whence Noah was called by his name, "the resting one," for in his life the sun and the moon rested. The ark was illuminated by a precious stone, the light of which was more brilliant by night than by day, so enabling Noah to distinguish between day and night.
The duration of the flood was a whole year. It began on the seventeenth day of Heshwan, and the rain continued for forty days, until the twenty-seventh of Kislew. The punishment corresponded to the crime of the sinful generation. They had led immoral lives, and begotten bastard children, whose embryonic state lasts forty days. From the twenty seventh of Kislew until the first of Siwan, a period of one hundred and fifty days, the water stood at one and the same height, fifteen ells above the earth. During that time all the wicked were destroyed, each one receiving the punishment due to him. Cain was among those that perished, and thus the death of Abel was avenged. So powerful were the waters in working havoc that the corpse of Adam was not spared in its grave.