the firm vault of the sky: a solid expanse God beat out overhead, holding back the waters above and carrying the lights
This word names the sky thought of as a hard, beaten-out dome stretched over the world. It comes from a verb used for a metalworker pounding gold or bronze into a thin sheet, and the Bible pictures the sky the same way: in Job a poet calls it hard as a mirror cast from molten metal. In the creation account God makes this vault to split the waters, keeping a great ocean above it from the waters below, and he sets the sun, moon, and stars in it. That is the one thing the word always points to, but writers press different parts of the picture depending on what they are saying.
In the creation account the stress falls on the vault as built structure: God commands it, makes it, and assigns the lights to it, so it is the architecture that turns watery chaos into an ordered world. In Ezekiel's vision the same dome becomes the shining floor under God's throne, and its solidity is felt all the more, since it is firm enough to hold up a throne and gleams like terrifying ice. In the Psalms and Daniel the picture turns toward its brightness: the dome announces God's glory without words, stands for his heavenly sanctuary, and shines so that the wise are said to shine like it.
So the senses below are not different objects. They are one vault seen from different angles:
- as the made structure of the world
- as the platform beneath God's throne
- as the radiant sky that displays and houses his presence