'Sky' in the Bible

Here the Pharisees and Sadducees came to Him; and, to make trial of Him, they asked Him to show them a sign in the sky.

He replied, "In the evening you say, 'It will be fine weather, for the sky is red;'

and in the morning, 'It will be rough weather to-day, for the sky is red and murky.' You learn how to distinguish the aspect of the heavens, but the signs of the times you cannot.

Then will appear the Sign of the Son of Man in the sky; and then will all the nations of the earth lament, when they see the Son of Man coming on the clouds of the sky with great power and glory.

Earth and sky will pass away, but it is certain that my words will not pass away.

"I am He," replied Jesus. "But I tell you that, later on, you will see the Son of Man sitting at the right hand of Omnipotence, and coming on the clouds of the sky."