I first read about this phenomenon a couple of years ago. I did some research on it, agreed with the premise, and wrote about the fourth turning on this blog.
Essentially the four turnings or cycles occur every 80 years. Like the seasons, the fourth turning occurs in the last 20 years of the 80 year cycle and marks a sort of winter, or death phase if you will. A cataclysmic ending to the events that preceded the onset of the fourth turning in the first 60 years of the cycle.
Many people including myself believe that we entered the fourth turning in 2008. Nothing in today's events are slowing this belief down- in fact- this President, Congress, and Supreme Court seem to be accelerating the fourth turning.
If you don't read anything else this week- read this. It is very well written and explains with precision how the events of today are nothing but lies and distractions and that ultimately- the shit really is going to hit the fan.