Job 26:7 - Matthew Poole's English Annotations on the Holy Bible

The north, i.e. the northern pole, or part of the heavens, which he particularly mentions, and puts for the whole visible heaven, because Job and his friends lived in a northern climate, and were acquainted only with that part of the heavens, the southern pole and parts near it being wholly unknown to them. The heavens are oft and fitly said to be spread or stretched out like a curtain or tent, to which they are resembled. The empty place, to wit, the air, so called, not philosophically, as if it were wholly empty; but popularly, because it seems to be so, and is generally void of solid and visible bodies. Upon nothing; upon its own centre, which is but an imaginary thing, and in truth nothing; or upon no props or pillars, but his own power and providence; which is justly celebrated as a wonderful work of God, both in Scripture and in heathen authors.