300 Foxes and a Donkey's Jawbone
A Space Between
Dividing the water above the firmament from the water below below it required physical space. Likewise, dividing the light from the darkness isn't the alternation of day and night, it's also the their separation by a physical space.
It's ironic that the period of history that brought us the scientific advances of Galileo, Kepler and Newton is called The Enlightenment, because this was when the human race plunged into darkness.
If no man has ascended up to heaven, except Jesus Christ who came down from heaven, then we have a few questions to ask...
The permanent physical separation of light from darkness, good from evil, starts by causing darkness to accumulate at the center of creation. It's what we're made of. Light is on the periphery.
Chapter 2 of Jonah includes a first-hand eyewitness account of the internal structure of the earth. It gives us the clues we need to assemble the pieces of our spherical hollow earth model (SHEM).