A leading pastor in the Messianic (Xian) movement concocted a theory about a series of lunar and solar eclipses which he claims will fulfill the prophecies of Yoel, chapters 2 and 3, and herald the second coming of oto ha'ish. Once it was picked up and publicized by John Hagee, it became a done deal. Now, good Jews are spreading it around. The clue to understanding the darkening of the sun and the change in the moon's color are given in the third verse of the third chapter and it has nothing to do with a series of standard eclipses.
Yoel, chapter 3, vss 3-4: "And I will perform signs in the heavens and on the earth: Blood, fire, and pillars of smoke. The sun shall turn to darkness, and the moon to blood, prior to the coming of the great and awesome day of the Lord."
What is translated as "pillars of smoke" (תִימְרוֹת עָשָׁן) can also be read as Palm trees of smoke - what, in the west, they like to call "mushroom clouds."
The simple reading of the text leads us to think that these occurrences are happening simultaneously. It stretches reason to think it's on and off and on and off for over a year or more. It makes much more sense that multiple explosions of nuclear bombs will give rise to atmospheric conditions which darken the sun in the sky and cause the moon to give off a red glow as if it had turned to blood.