'Sky' in the Bible

But I say to you in truth, there were many widows in Israel in the days of Elijah, when the sky was shut up for three years and six months, when a great famine came over all the land;

You hypocrites! You know how to analyze the appearance of the earth and the sky, but why do you not analyze this present time?

For just like the lightning, when it flashes out of one part of the sky, shines to the other part of the sky, so will the Son of Man be in His day.