And God said, Let there be a firmament in the midst of the waters, and let it divide the waters from the waters.
(Genesis 1:6) KJV
And God saw the light, that it was good: and God divided the light from the darkness.
(Genesis 1:4) KJV
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.
A space between: בֵּ֥ין – bayin
- interval, midst, a middle man, umpire 1 Sa. 17. 4
- between, betwixt; and within, of space and time.
- between – and, sometimes also whither – or between, among, with motion implied; as among Is. 44:4 and from between, out of; among, with motion implied.
Davidson Analytical Hebrew and Chaldee Lexicon page LXXX

Where did you get here from? | |
1 | February 9th – Separation |
2 | December 5th – A Space Between |