Not an expert on prophecy but it says that the moon will be as bright as the sun, and the sun will be 7 times brighter.
It makes sense that if the 7 is brighter by 7x that the reflection of the sun on the moon will also be brighter.
What that means is a few things. On first read, it makes me think that the earth has moved closer to the sun, or that the sun is about to nova. In both cases, that means extinction of life btw.
But, 7x brighter, doesn't necessarily mean 7x hotter believe it or not. Since the magnetic field on the planet has decreased to only a small fraction of what it once was, and there is evidence that it has even reversed at one point, it's possible that the sun is indeed perceived by us as brighter now than it was 10,000 years ago.
A semi-popular view of the weakend magnetic fields and other shifts could be used to explain why humans once lived hundreds of years, but don't anymore. Because, remember, God doesn't use MAGIC, but the rules of physics that He created to maintain His creation.
Of course, this is all conjecture. These theories are no more validated than the theories of evolution, or the theories concerning Tom Cruise's popularity. There simply is no solid evidence of it beyond theoretical possibilities.