But... we don't understand it from our human perspective. Isn't that the point of all this? The descriptions in the text are difficult to reconcile with our perspective at this point.
Now, I accept that the descriptions were understood by the author and his timely audience. However, today we have a much better understanding of astronomy then they did, and that understanding is difficult to reconcile with the content of the text.
Therefore, I'll agree that the original audience understood it from their perspective, but that says very little about our understanding it from our perspective today.
For example, the very fact that light on earth precedes the astronomical bodies by four days is completely misunderstood to a generation that accepts that light is produced by those astronomical bodies and reaches us in a measurable amount of time determined by the speed of light. Quite frankly, this description isn't really understandable at all to our generation, unless we disregard concepts very important to our generation, which just seems counter-intuitive...
Personally I don't believe that there is an issue understanding Genesis with our present understanding of cosmology. There are a plethora of scientific hypothesis and theories attempting to explain origins but all have serious issues that need to be explained. Secondly, there are quite a few of these theories that point to a "designer" but are only viewed under the naturalistic priori.
The grammar of Gen. 1 and 2 does not support days longer than an evening-morning cycle unless one uses the words semantic range definitions outside of their context and ignore modifiers (or lack of them).
Here is what we have grammatically:
1. God created the heavens and the Earth. Verse 1.
2. The Earth was void, dark, and water covered the globe. Verse 2.
3. The Spirit of God hovered over the waters (plural). The waters covered the globe therefore the Spirit hovering covered the globe. Verse 2.
4. God created light prior to the "grater light (generally understood as the sun) and the "lesser" light (normally understood as the moon). Verse 3.
5. God called the light good and separated the light from the darkness. Verse 4.
6. God named the light day and the darkness night. He defined one day as an evening-morning cycle. Verse 5.
Verse 1 describes the action while verse 2 describes the condition after the action. Verse 3 and 4 describe the actions and verse 5 defines the actions. There is no textual evidence of any "time" in between actions nor is there any textual evidence that God's definition of one day differs from what we consider one day today. None of today's scientific theories have refuted a literal reading of Genesis nor is the text hard to understand given our present state of knowledge.
Now, delving into today's scientific theories are beyond the scope of your OP but we can certainly discuss them if you wish, however, I stopped debating in this forum a long time ago because of the "fanaticism" of the naturalistic priori so I can't guarantee that I will continue if it heads that direction.