You forgot to cite your source, which I stumbled onto at http://www.lhup.edu/~dsimanek/febible.htm , and which contradicts you. Where does your bible say clearly and unambiguously that it is not referring to a physical dome or vault? Nowhere. But it does do the opposite, as your own source attests:We're discussing "vault" and "dome", well the "vault" of heaven is a crucial concept. The word firmament appears in the King James version of the Old Testament 17 times, and in each case it is translated from the Hebrew word raqiya, which meant the visible vault of the sky, which is space - the universe, that bible calls it "the heavens".
"If these verses are about a mere illusion of a vault, they are surely much ado about nothing ... Other passages complete the picture of the sky as a lofty, physical dome. God sits throned on the vaulted roof of earth ...[Isaiah 40:22].... Job 22:14 says God walks to and fro on the vault of heaven [chuwg]. In both verses, the use of chuwg implies a physical object, on which one can sit and walk."
Here's more evidence against your position :
Genesis 1:6 says, "And God said, Let there be a firmament in the midst of the waters, and let it divide the waters from the waters."
Job 37:18 says, "Have you with him spread out the sky, which is strong, and as a molten mirror?"
Sorry, but you're wrong. Your bible does not support your claim that the vault or dome referred to in it is not a physical structure.
And as we just saw, all of your extra study of it has produced no knowledge. Your pronouncements of what it means are your opinions, and not very good ones at that.