I believe the Creator of the sun knew that He would make days be 24 hours!
Yeah, but without the Sun, the Earth would not have any day of any length at all. If you want to take the Bible literally, you have to be consistent. Taking the Bible too literally gets you in all kinds of illogical traps like this. It hurts evangelism to insist seekers believe the unbelievable. It is hard enough to explain the Resurrection without having to explain days with out Sun or two different stories of creation that contradict each other.
Your view isn't literal if you insist on imaginings. The Sun did not exist until the fourth day. That means there was no 24 hr periodicity.
The explanation for the morning and evening passages is in the Hebrew thought poetry of Gen 1. It is a simple parallelism to end each "stanza".