I was wondering that too(encapsulation), especially since almost the same words are used by
Rev 6:12-13 as
Matt 24:29. Next verses is about the return of Jesus,
Matt 24:30-31
.
I've gone back and forth on the encapsulation thing. But right now I'm beginning to think that Revelation is chronological with some overlaps. One reason is because of the verses you quoted.
Revelation 6:12-13 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, even as a fig tree casteth her untimely figs, when she is shaken of a mighty wind.
Matthew 24:29 Immediately after the tribulation of those days shall the sun be darkened,
and the moon shall not give her light, and the stars shall fall from heaven, and the powers of the heavens shall be shaken:
After the tribulation the moon in Mt. 24 doesn't her give light. That's different than a moon that is said to be
blood red. Granted they are both celestial events but I think the difference is that the blood red moon is at the beginning of tribulation just after the opening of the first 4 seals which would also be confirmed by a great earthquake most likely in the Middle-East. The reason for that is when pollutants are released into the atmosphere it causes the moon to appear red especially when it first rises. As the tribulation progresses and gets worse with natural disasters like volcanoes to add to the mix eventually the moon will be darkened...
after tribulation.