We have to account for a passage in Psalm 18 where the Bible tells us that God is in both 1) thick darkness and 2) has brightness before Him, at the same time and in the same context.
Brightness Before and Darkness Under
April 2nd
The firmament accounts for our empirical observations of the cosmos, it’s the “missing” 90% of the mass of the universe. We propose a mechanism for how the inner surface was blackened at the beginning of the fourth day.