Chapter 26

Job answers Bildad:

7 He stretches out the north over the void and hangs the earth on nothing. [Job 26:7 ESV]

How could Job know this?  How does he know the world is floating in empty space?

9 He covers the face of the full moon and spreads over it his cloud. [Job 26:9 ESV]

Is this a reference to a lunar eclipse?

10 He has inscribed a circle on the face of the waters at the boundary between light and darkness. [Job 26:10 ESV]

You have to be airborne and quite high up to see this.  How could he know it? How is this possible that he knows this!

Job seems to be elaborating on the majesty of God, his ways, his knowledge.  This does not seem to be a direct answer to Bildad.