I've posted this before; I'll probably have to post it many times more:
I've done a bit of looking into Strong's Concordance for the King James version:
Isa 40:22I've underlined the phrase with the word for "circle" [chuwg] (Strong's 02329). Here are the only other verses that use the same word (also underlined), none of which implies a "sphere":
[It is] he that sitteth upon the circle of the earth, and the inhabitants thereof [are] as grasshoppers; that stretcheth out the heavens as a curtain, and spreadeth them out as a tent to dwell in
Job 22:14Word Search Results for "sphere" -- NONE
Thick clouds [are] a covering to him, that he seeth not; and he walketh in the circuit of heaven.Pro 8:27
When he prepared the heavens, I [was] there: when he set a compass upon the face of the depth
Word Search Results for "ball " [duwr] (Strong's 01754). Here are all verses that use the word for "ball" [NOTE: Two verses are in the same book as the "circle of the earth" passage, so the author of Isaiah had both words at his disposal]:
Isa 22:18
He will surely violently turn and toss thee [like] a ball into a large country: there shalt thou die, and there the chariots of thy glory [shall be] the shame of thy lord's house.Isa 29:3
And I will camp against thee round about, and will lay siege against thee with a mount, and I will raise forts against thee.Eze 24:5
Take the choice of the flock, and burn also the bones under it, [and] make it boil well, and let them seethe the bones of it therein.
[The Hebrew lexicon gives this meaning as "a burning pile, a round heap of wood"]
That's some good stuff, PH. Good job.