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what did 'firmament' mean to ancient israelites, compared to our modern understanding of space?

Adds the setting and its conversation across both testaments.

Genesis 1:6-8

“God said, “Let there be an expanse in the middle of the waters, and let it divide the waters from the waters.” God made the expanse, and divided the waters which were under the expanse from the waters which were above the expanse; and it was so. God called the expanse Sky. There was evening and there was morning, a second day.”

These verses come from the first creation account in Genesis, a foundational text for ancient Israel. It describes God's act of bringing order to a chaotic, watery world, focusing here on the creation of a 'firmament' or 'expanse' on the second day.

How might our understanding of the natural world, both ancient and modern, shape our awe and reverence for its origins?

Then — the setting

For ancient Israelites, the 'firmament' (Hebrew: *raqia'*) was understood as a solid, dome-like structure, like a hammered-out metal bowl, placed between the 'waters above' (thought to be the source of rain) and the 'waters below' (oceans, lakes). This cosmology was common in the ancient Near East, viewing the earth as a flat disk with the firmament holding back cosmic waters, allowing a space for life. It was not a scientific explanation in our modern sense, but a theological statement about God bringing order and creating a habitable world from primeval chaos, separating realms.

Across the Testaments

The Old Testament consistently reflects this ancient cosmic understanding, with passages in Psalms, Job, and Proverbs describing the heavens as a solid, vast expanse where God dwells or from which he acts. The New Testament, written centuries later, does not directly update or contradict this ancient cosmology with a scientific one. Instead, it builds on the theological implications, often using the imagery of 'heaven' (referring to the sky and God's dwelling) metaphorically to speak of God's power, presence, and transcendent reality, rather than offering a precise physical description of space. The focus remains on the Creator, not the mechanics of creation.

Keep thinking

Read alongside it

Psalm 19:1
This verse describes the heavens declaring God's glory, echoing the idea of the firmament as a divine creation.
Job 37:18
This passage mentions God spreading out the skies, 'strong as a molten mirror,' reflecting a similar ancient cosmological view.
2 Peter 3:5-7
This New Testament passage references the heavens and earth being formed out of water and by water, connecting to the Genesis creation account.

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