Again, I believe you are putting too much reliance on the sun as a point of reference. Given that God created light and described day and night prior to creating the sun, there is no reason to think that the rotational speed of the earth was substantially different than it is now... unless you have an a priori belief to support. The onus would be on you to support your position with something more substantial than a hypothesis... especially when it runs counter to the plain text.
Okay. I am using references to scales that we are familiar with (and that are objectively necessary to understand terms like "day")
But, if we use your (stubborn) logic,
1. In the beginning God created the heaven and the earth.
2 And the earth was without form, and void; and darkness was upon the face of the deep. And the Spirit of God moved upon the face of the waters.
3 And God said, Let there be light: and there was light.
4 And God saw the light, that it was good: and God divided the light from the darkness.
5 And God called the light Day, and the darkness he called Night. And the evening and the morning were the first day.
With verses 1-2, we have creation without ANY light, period. It existed without ANY reference to light (as you said described day). This is an *immeasurable* (by *any* metric) amount of "time", which completely and irrefutably disallows any literal interpretation of Genesis 1 within the bounds of our concept of time.
It is SIMPLY IMPOSSIBLE. (And I don't care if it appears that I am "yelling". I don't mean to be rude, but the truth is not an *opinion*. It is important).