Isaiah 40:22
"It is He who sits above the circle of the earth, And its inhabitants are like grasshoppers, Who stretches out the heavens like a curtain And spreads them out like a tent to dwell in."
Much is made of Isaiah 40:42 where it is asserted that Isaiah told us all that the earth is a sphere. But is this what was really meant by the word the translator's usually present to us as "circle"?
The Hebrew word in Strong's transliteration is "chug". Here are all the verses in which the Hebrew word "chug" appears, included one use of "chug" as a verb:
Isa 40:22
It is He who sits above the [chug] of the earth,
And its inhabitants are like grasshoppers,
Who stretches out the heavens like a curtain,
And spreads them out like a tent to dwell in.
NKJV
Job 22:14
4 Thick clouds are a covering to him, that he seeth not; and he walketh in the [chug] of heaven.
KJV
Prov 8:27-29
When he prepared the heavens, I was there: when he set a [chug] upon the face of the depth: When he established the clouds above: when he strengthened the fountains of the deep: When he gave to the sea his decree, that the waters should not pass his commandment: when he appointed the foundations of the earth:
Job 26:10-11
He hath [chugged] the waters with bounds, until the day and night come to an end.
The pillars of heaven tremble and are astonished at his reproof.
There are some things we can notice about these verses. What is the common meaning between these verses? I submit that it is quite clear the word does not means "sphere". It is also clear the word always is used in the context of the big picture of the earth and even more.
The talmudic writers leave no doubt that their literalistic interpretation of the firmament of Genesis One was simply that of the great bowl of the sky, placed as a dome over the flat earth. You may research this for yourself by searching for "talmud" and "firmament" over the internet; here is a good link you might find that way.
http://www.daatemet.org.il/pamphlets/en_pamphlet4.html
It is quite plain that the word "chug", then, can easily be understood as a reference to the Firmament; it can easily be considered as an alternate word for the same idea. Proverbs 8:27 almost cries out to interpret the word [chug] in that way.
It is also quite plain that this word is no proof that the earth itself is shown by Isaiah to be a sphere.