Are the days of creation real or are they periods?

When the Bible was written, there was no science as we think of it. People were just learning a trade in the field. Those who could read and write were among the learned. And Moses, to whom this pattern is attributed, was a great scientist whose prowess during the crossing of the deserts is no longer to be demonstrated. If I start to tell you about these feats, which are thought to be divine interventions, when in fact they were physical achievements, you will not believe it. We are the ones who maintain that these were days because they were written that way. As for me, I tell you that he lacked the right words to express these ideas and that they were stages of the creation of the Universe. In order to understand that he lacked adequate words, I hope that you have read my second and third publication entitled what “In the"In the beginning God created the heaven and the earth” mean? What does “in the beginning God created the heaven” (i) - Open Forum / Biblical Interpretation - The BioLogos Forum