“There will be signs

In the sun,

The moon,

And the stars.

On the earth,

There will be

Anxious distress

Among the nations

With the roaring noise

Of the sea

And the swelling waves.”

Καὶ ἔσονται σημεῖα ἐν ἡλίῳ καὶ σελήνῃ καὶ ἄστροις, καὶ ἐπὶ τῆς γῆς συνοχὴ ἐθνῶν ἐν ἀπορίᾳ ἤχους θαλάσσης καὶ σάλου,

Luke indicated that Jesus said that there would be signs (Καὶ ἔσονται σημεῖα) in the sun (ἐν ἡλίῳ), in the moon (αὶ σελήνῃ), and in the stars (καὶ ἄστροις).  On the earth (καὶ ἐπὶ τῆς γῆς), there would be anxious distress among the gentile nations (συνοχὴ ἐθνῶν ἐν ἀπορίᾳ) because of the roaring noise of the sea (ἤχους θαλάσσης) and the swelling waves (καὶ σάλου).  This was a unique use of the term ἀπορίᾳ that means perplexity, anxiety, or doubt, not found elsewhere in the Greek biblical literature.  This Jesus saying is similar to Matthew, chapter 24:29, that is actually closer to Mark, chapter 13:24-25.  Mark indicated that Jesus said that in those days (Ἀλλὰ ἐν ἐκείναις ταῖς ἡμέραις), after the sufferings (μετὰ τὴν θλῖψιν), 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 assumption was that the moon had its own source of light, not merely a reflection of the sun.  The stars would fall from the skies (καὶ οἱ ἀστέρες ἔσονται ἐκ τοῦ οὐρανοῦ πίπτοντες).  Matthew indicated that 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).  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.  Luke did not have the details that were in Mark and Matthew.  What kind of cosmic upheaval do you expect at the end times?