“Does the Bible Teach that the Earth is Flat?”
They simply assumed that the ERETZ was basically flat, a disk of land visible to the horizon. (ERETZ was and still is the Hebrew word for “land”, “country”, or even region, as in the names of various wilderness areas. ERETZ was the opposite of “the heavens”/“sky”. ERETZ YISRAEL was and still is “The Land of Israel”, not “Planet Israel.”)
It is anachronistic to assume that they thought in terms of “planet earth” and the average person had no real need to think much beyond “the circle of the ERETZ” concept. I cringe every time I hear a concordist claim that “the circle of the earth” phrase in scripture was an amazing, divinely-revealed awareness of a spherical earth. It wasn’t. It was simply a reference to what anyone can see if they step outside and look to the horizon in all directions.
Everybody lives on a circular disk of land. In reality, it deviates from a perfectly flat plane by a curvature of only a few inches per mile! Yet, that in no way was in the mind of the authors of those scriptures. They didn’t need to have our modern day understanding of planet earth’s shape and God had no reason to plant “science prophecies” in the ancient text of the Bible.
There is a popular “The Bible Got the Science Right Long Before the Scientists” table in circulation that is a total embarrassment to any science-literate Christian. It includes “the circle of the earth” misunderstanding of the above. How much damage has been done by “Christian apologists” working hard to “help out” the Bible?