And a firmament setting over it like a vaulted dome as Isaiah explains: Isaiah (xlix, 22): He who established heaven as a vault., which is fastened to earth, Job: He has inclined heaven to earth, and it has been poured out as the dust of the earth. I have welded it as a square block of stone.
Moses, likewise, in describing the table in the Tabernacle, which is an image of the earth, ordered its length to be of two cubits, and its breadth of one cubit. So then in the same way as Isaiah spoke, so do we also speak of the figure of the first heaven made on the first day, made along with the earth, and comprising along with the earth the universe, and say that its figure is vault like. Cosmas Indiocopleustes, Christian Topography