"Perhaps beginning with Origen, the different identifiers used for heavens in the Book of Genesis, caelum and firmamentum, sparked some commentary on the significance of the order of creation (caelum identified as the heaven of the first day, and firmamentum as the heaven of the second day).[8] Some of these theories identified caelum as the higher, immaterial and spiritual heaven, whereas firmamentum was of corporeal existence.[9]: 237 
Christian theologians of note writing between the 5th and mid-12th century were generally in agreement that the waters, sometimes called the "crystalline orb", were located above the firmament and beneath the fiery heaven that was also called empyrean (from Greek ἔμπυρος). One medieval writer who rejected such notions was Pietro d'Abano who argued that theologians "assuming a crystalline, or aqueous sphere, and an empyrean, or firey sphere" were relying on revelation more than Scripture.[10]
About this Ambrose wrote: "Wise men of the world say that water cannot be over the heavens"; the firmament is called such, according to Ambrose, because it held back the waters above it.[11]
This matter of the position of the "waters" above the firmament was considered by Augustine in De Genesi ad litteram (perhaps his least studied work): "only God knows how and why [the waters] are there, but we cannot deny the authority of Holy Scripture which is greater than our understanding"."

God createth Heaven and Earth, and all things therein, in six days.

1 In the beginning God created heaven, and earth.  2 And the earth was void and empty, and darkness was upon the face of the deep; and the spirit of God moved over the waters.  3 And God said: Be light made. And light was made.  4 And God saw the light that it was good; and he divided the light from the darkness.  5 And he called the light Day, and the darkness Night; and there was evening and morning one day.
6 And God said: Let there be a firmament made amidst the waters: and let it divide the waters from the waters.  7 And God made a firmament, and divided the waters that were under the firmament, from those that were above the firmament, and it was so.  8 And God called the firmament, Heaven; and the evening and morning were the second day.  9 God also said: Let the waters that are under the heaven, be gathered together into one place: and let the dry land appear. And it was so done.  10 And God called the dry land, Earth; and the gathering together of the waters, he called Seas. And God saw that it was good.

Genesis also talks about the "windows of heaven" that were opened at the time of the Flood, as if the firmament had openings to let the WATERS down to the earth below.

If you're a Glober, you have to take all this as poetic language and old-fashioned, archaic, FAIRY TALE LIKE figurative imagery. But that is not necessary.

...and that's why Flat Earth matters.

The Globe Earth is the FOUNDATIONAL lie, upon which Secularism, Materialism, Communism, Evolution, Liberalism, Americanism/Democracy, and all the other modern errors rest!

If the earth is flat under a firmament/dome, then there is CLEARLY a Creator who is God. Mankind is special among the beasts, being the only physical being with intellect and Free Will. Also, this Man must follow God and His law, and give some concern for his eternal destiny. True AI won't ever be possible as Man can't create immortal immaterial souls, there are no aliens or other "planets" to visit, and we must worship God rather than Man. Think of all the things we wouldn't waste our time and money on, if humanity at large realized that God created them!

Interesting.  I haven't heard that, though this would seem to require a change in the long-term speed of the sun to alter 360 to 365 long term.  If the sun resumed after the stoppage at the same speed it was going before, there would be a single hit to the time of year.  Or when it resume it would have just been that time stopped and nothing really changed.