The Book of Proverbs (8:27) probably contains the one proof in the Hebrew scriptures of the understanding existing a thousand years BC that the Earth is a sphere. "...when he marked out the horizon on the face of the deep" (Proverbs 8:27) has two words that say it all - horizon and face. 'Horizon' or 'edge', Hebrew chug, indicates they could stand in a boat at sea and in each direction see an edge the same distance from them whichever direction they were and this would be the same in whichever geographical location they were at sea. 'Face' literally human face, Hebrew paneh, clinches it because this is used to describe that circle around the observer at sea formed by the horizon. A face is circular. It clinches the proof because a face on a person's head is curved so the nose is higher than the ears if the face is horizontal and looking from the surface in the centre where the nose is, all that can be seen is as far as the ears and chin and top of head which is here compared to the horizon; and of course the reason for this is that the head is spherical like a ball. So picking these words chuga and paneh to describe the Earth as observed from sea (the deep, Hebrew tehom) shows an understanding of not just a spherical Earth but how the horizon at sea proves that understanding.
