“Immediately

After the sufferings

Of those days,

The sun

Will be darkened.

The moon

Will not give its light.

The stars

Will fall

From heaven.

The powers

Of the heavens

Will be shaken.”

Εὐθέως δὲ μετὰ τὴν θλῖψιν τῶν ἡμερῶν ἐκείνων ὁ ἥλιος σκοτισθήσεται, καὶ ἡ σελήνη οὐ δώσει τὸ φέγγος αὐτῆς, καὶ οἱ ἀστέρες πεσοῦνται ἀπὸ τοῦ οὐρανοῦ, καὶ αἱ δυνάμεις τῶν οὐρανῶν σαλευθήσονται.

This is exactly the same, almost word for word, in Mark, chapter 13:24-25, with a vague reference to this in Luke, chapter 21:25.  Jesus said that immediately after the sufferings mentioned earlier in those days (Εὐθέως δὲ μετὰ τὴν θλῖψιν τῶν ἡμερῶν ἐκείνων), there would be a cosmic upheaval.  The sun would be darkened (ὁ ἥλιος σκοτισθήσεται).  The moon would not give its light (καὶ ἡ σελήνη οὐ δώσει τὸ φέγγος αὐτῆς).  The stars would fall from the skies (καὶ οἱ ἀστέρες πεσοῦνται ἀπὸ τοῦ οὐρανοῦ).  The powers of the heavens would be shaken or stirred up (καὶ αἱ δυνάμεις τῶν οὐρανῶν σαλευθήσονται) in this time of complete darkness, during this celestial disturbance.  This is fully in line with the great Israelite prophetic tradition of the Day of Yahweh, like Ezekiel, chapter 32:7, Joel, chapter 2:10, Amos, chapter 8:9, and Zephaniah, chapter 1:15