This is how God wants us to measure earthly days.
Genesis 1:14 And God said, “Let there be lights in the vault of the sky to separate the day from the night, and let them serve as signs to mark sacred times, and days and years,
This is what I'd perceived from this verse was a description of what Moses has saw in his vision that in the middle of this sphere of water( that was suspended in this emptiness) was darkness floating around within the center of this sphere, while the light of God reflecting on the surface of it. Then a flash of light had appeared in the center of it like a sun, and then this light had dimmed and which this time period of this flash of light was considered to be called a day. So each flickering of this light is called a day and which God had made the sun to measured each flickering of light. I believe we are moving very quickly and all that has happened was just a mere moment of time consider to eternal time and which I believe that time is at a stand-still and which there isn't any night, but just day. We are use to having seasons but which Adam and Eve weren't use to this change in pattern, and which the Fall season represented the fall of them from the presence of God.
Genesis 1:5 God called the light “day,” and the darkness he called “night.” And there was evening, and there was morning—the first day.
Isaiah 40:22 He sits enthroned above the circle of the earth, and its people are like grasshoppers. He stretches out the heavens like a canopy, and spreads them out like a tent to live in.
James 4:14 Why, you do not even know what will happen tomorrow. What is your life? You are a mist that appears for a little while and then vanishes.