Biblical comment (prompted by another thread):

[Tuesday Afternoon]

Time is measured as the the earth revolves around the sun.

The sun was created on the fourth day therefore:
who knows what happened, when it happened or how it happened.

Day 4: God creates lights in the heavens. Here is the fifth divine command, "Let there be lights in the expanse of the heavens..."
These lights were made to separate light from darkness and to mark days, seasons and years.
These lights consisted of "two great lights...and the stars." One light was to rule the day, and the second was to rule the night.