Have you factored the sun's luminosity, listed as appearing in the 4th creation day in the texts?
quote:
Gen. 1/16 And God made the two great lights: the greater light to rule the day, and the lesser light to rule the night; and the stars.
17 And God set them in the firmament of the heaven to give light upon the earth
That verse culminates in the 4th creation day, and says also, that the earth was NOT lit before this instant, and that the separation of day and night had NOT begun. This makes the 24 divisions of the day [hours] premature, and would signify no purpose - specially before the advent of humans.
This has another subsequence, namely that the creation days are varied from latter days, making these six days as cosmic days, or epochs of time. It is affirmed by the calendar decreed in genesis, which begins its first day not with these creation days but with the birthday of Adam.
Scientifically, there is a good match here: stars do not become luminous untill a fruition stage, and are not born as fully developed stars.