'Sky' in the Bible

For I assure you and most solemnly say to you, until heaven and earth pass away, not the smallest letter or stroke [of the pen] will pass from the Law until all things [which it foreshadows] are accomplished.

But He replied to them, “When it is evening, you say, ‘It will be fair weather, for the sky is red.’

And in the morning, ‘It will be stormy today, for the sky is red and has a threatening look.’ You know how to interpret the appearance of the sky, but cannot interpret the signs of the times?

“Immediately after the tribulation of those days the sun will be darkened, and the moon will not provide its light, and the stars will fall from the sky, and the powers of the heavens will be shaken.

And at that time the sign of the Son of Man [coming in His glory] will appear in the sky, and then all the tribes of the earth [and especially Israel] will mourn [regretting their rebellion and rejection of the Messiah], and they will see the Son of Man coming on the clouds of heaven with power and great glory [in brilliance and splendor].

Heaven and earth [as now known] will pass away, but My words will not pass away.

Jesus said to him, “You have [in fact] said it; but more than that I tell you [regardless of what you do with Me now], in the future you will see [Me revealed as] the Son of Man seated at the right hand of Power, and coming on the clouds of heaven.”