the.com/firmament

the dome the ancients swore was solid, holding back an ocean overhead.

means The vault of the sky, especially the heavens regarded as a solid arch or dome over the earth.

from From Latin firmamentum, 'a support or strengthening,' built on firmare 'to make firm' (the same root behind firm and confirm). The Latin word was chosen to translate the Hebrew rāqîaʿ in Genesis — a term suggesting something beaten out or hammered flat, like metal — reflecting the ancient picture of a solid expanse stretched overhead to separate the waters above from the waters below. So the word literally carries the old conviction that the sky was a firm, fixed thing.

literal meaning
From Latin for a hard, beaten-out metal sheet.
flood plumbing
Genesis says rain came through its opened windows.
cosmic ceiling
Believed to physically separate waters above from below.
poetic survival
Now mostly means the starry sky, dramatically.
for instance

celestial sphere — ancient astronomical model mapping stars and planets across the visible sky from earth

vault of heaven — biblical concept in genesis 1:6-8 describing the dome separating waters above and below

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