And God made two great lights; the greater light to rule the day, and the lesser light to rule the night: he made the stars also.
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Victorinus of Pettau
AD 303
To me, as I meditate and consider in my mind concerning the creation of this world in which we are kept enclosed, even such is the rapidity of that creation; as is contained in the book of Moses, which he wrote about its creation, and which is called Genesis. God produced that entire mass for the adornment of His majesty in six days; on the seventh to which He consecrated it . . . with a blessing. For this reason, therefore, because in the septenary number of days both heavenly and earthly things are ordered, in place of the beginning I will consider of this seventh day after the principle of all matters pertaining to the number of seven; and as far as I shall be able, I will endeavour to portray the day of the divine power to that consummation.
In the beginning God made the light, and divided it in the exact measure of twelve hours by day and by night, for this reason, doubtless, that day might bring over the night as an occasion of rest for men's labours; that, again, day might overcome, and thus that labour might be refreshed with this alternate change of rest, and that repose again might be tempered by the exercise of day. On the fourth day He made two lights in the heaven, the greater and the lesser, that the one might rule over the day, the other over the night, Genesis 1:16-17 — the lights of the sun and moon and He placed the rest of the stars in heaven, that they might shine upon the earth, and by their positions distinguish the seasons, and years, and months, and days, and hours.