THE SEALS  ARE DESCRIBED BY JESUS IN THE GOSPEL OF LUKE............

The events described by Jesus in ( Luke 21:20-24 ) are the very SAME EVENTS described when Jesus opens Seals two, three, and four in ( Revelation 6:3-4 ), and releases the rider on the red horse, ie. Gog,  to carry out his assigned mission which is to BRING THE GOG-MAGOG WAR exclusively against the land and people of Israel to fulfill the prophecy of ( Ezekiel 38:16 ).  

Now compare the content of the following two Scriptures :

The events described by Jesus in ( Luke 21:25-27 ) are the very SAME EVENTS described when Jesus opens Seal six in ( Revelation 6:12-13 ). 

Luke 21:25 ( Jesus is describing  the events of the  sixth seal )

"And there shall be SIGNS IN THE SUN, and IN THE MOON, and IN THE STARS, and UPON THE EARTH ( a great earthquake ) ....

Revelation 6:12-13 ( Jesus is describing the events of the sixth seal )

"And I beheld when He had opened the sixth seal, and lo, there was a great EARTHQUAKE; and THE SUN BECAME BLACK AS SACKCLOTH OF HAIR, and THE MOON BECAME AS BLOOD , and THE STARS OF HEAVEN FELL UNTO THE EARTH........." 

SO, THERE YOU HAVE IT:

There can be NO DOUBT WHATSOEVER that BOTH of the Scriptures cited above in ( Luke 21 ) AND ( Revelation 6 )  are Jesus speaking of the VERY SAME EVENTS .  In His Olivet Discourse, as recorded in ( Luke 21:20-24 ), Jesus is describing the Gog-Magog War of His vengeance upon Israel in detail. Seals two, three, and four are also describing the events of the Gog-Magog War 

According to Your Holy Word, come Lord Jesus !