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Vault of the Earth
EARTH, VAULT OF THE (אֲגֻדָּה, H99, band, thong, vault). This infrequent word can denote the fetters of prisoners (
M. H. Pope, “Job,” The Anchor Bible (1965), 151; E. J. Young, The Book of Isaiah, I (1965), 396.
International Standard Bible Encyclopedia (1915)
In one passage God is said to have "founded his vault (’aghuddah) upon the earth" (
The latter is the usual interpretation, but in either case the reference is rather to the strength of the structure than to its form; the word implying something that is firmly bound together and hence, an arch or dome because of its stability.
See also ASTRONOMY, sec. III, 2.