'Sky' in the Bible

Hast thou with him spread out the sky, firm, like a molten mirror?

It shall be established for ever as the moon, and the witness in the sky is firm. Selah.

But he answering said to them, When evening is come, ye say, Fine weather, for the sky is red;

and in the morning, A storm to-day, for the sky is red and lowering; ye know how to discern the face of the sky, but ye cannot the signs of the times.