to Neil,
There are many references to apocalyptic literature. I cannot off-hand single out any one. But it is widely understood that apocalyptic literature is an attempt to give meaning to past events known to readers/hearers and it does this by creating prophetic scenarios prior to those events.
Yes, that's what "Mark" did about the events of 70 but he did create the other prophetic scenario (celestial and second coming) to happen in the near future (after the events of 70).
The Book of Daniel, for example, was not written in Babylonian or Persian times but was set in those times; prophecies of events that were known to the book's audience were put in the mouths of angels coming to Daniel way back in the days of earlier kings (Nebuchadnezzar and Darius). The events were narrated in vague mysterious ways as befits a divine prophecy (and avoids risking accusations of disloyalty to political powers of the day) but the readers/hearers knew exactly what they were referring to.
Yes that's what "Mark" did: he vaguely narrated events leading to (and including) the fall of Jerusalem. When? After that happened. And that was enough for the hearers to know exactly what they were referring to.
These prophecies set in earlier times made sense of the world as it had been experienced by the audiences. They could be assured that God was in charge and working things out after all.
Yes that's what "Mark" did, more so through the parable of the tenants.
The Book of Isaiah was not written before the fall of Babylon but it did "prophecy" the fall of Babylon accompanied by chaos in the heavens and the earth thrown out of its place and surviving humans being "rarer than fine gold" (all "future tense", as you like to stress). None of those things happened literally. These are standard apocalyptic metaphors to depict the fall of kingdoms.
The book of Isaiah was written over a long period of time by different authors who added up their stuff to the end (at that time) of the book. The first part was written before the fall of Jerusalem, the second part (by stages) during the Persian rule but before the temple was rebuilt.
In ch. 13, "Isaiah" has a prophecy against Babylon, using the future tense, but that prophecy is genuine (that is not made after the facts) but ultimately wrong: he predicted Babylon will be conquered by the Medes (not the Persians) and then become inhabited (that did not happen for a very long time). And that's when
"The stars of heaven and their constellations will not show their light. The rising sun will be darkened and the moon will not give its light." (13:10) duly copied by "Mark".
That, and the circumstances and consequences of the fall of Babylon evidently did not occur. The same for the second coming and the heavenly chaos as predicted by Jesus (allegedly) in gMark.
So I do not see how it serves your theory. The only difference is "Isaiah" predicted the fall of Babylon (with the celestial events) before it happened, and "Mark did so for the fall of Jerusalem (but after it happened) with the celestial events to occur soon afterwards.
David tells us that God came down from heaven in thick clouds and with his breath laid bare the foundations of earth and picked him up and rescued him from his enemies. So God has already come to earth and delivered his favorite saint. Perhaps he will do it the same way again -- as Daniel and Mark imply.
Well, David had invented a story (allegedly happening in the past) to make him look good (for propaganda purpose). But that's not relevant: this is not a prophecy about future events. I do not see the connection between "Mark" second coming to happen in the future and God having come down for David in the past. This kind of second coming is also in 1 Thessalonians (with the future tense), which is probably where "Mark" got it (or from the Ps 18, I don't care). "Perhaps he will do it the same way again". Why not? But what does that have to do with the issue of prophecy about future events?
No-one dates Daniel or Isaiah on the basis of apocalyptic signs in the heavens not having happened at the time they wrote. Why date Mark that way?
And the second coming for gMark. And not at the time they wrote but after, and for "Mark" SOON after the fall of Jerusalem, that "Mark" knew about.
I am quite sure there are scholars who put gMark soon after the fall of Jerusalem because the celestial events and the second coming did not come in
"those days".
And Mark, we know, made abundant use of Daniel and Isaiah -- probably more than any other books of the OT, quoting and alluding to them abundantly. So it is reasonable to think that when Mark spoke of heavenly signs he was continuing to follow the usage of these images in Daniel and Isaiah, too.
Sure, it might be so, but that does not change the fact "Mark" used these images in a prophecy to happen in the near future, relative to the fall of Jerusalem.
Cordially, Bernard