Sorry for the bad spelling in the title, I literally cannot remember what it was called, but someone pointed out that every seven years in September something has been occurring that causes a market downturn?

2001: September 11th happened, market downturn 2008: The home loan margin call / financial bubble pop, market downturn 2015: Don't remember this one too well, but apparently something happened here too. And now it's September again, seven years later and I guess it's supposed to be the 7th cycle of a 7-year event so it's going to be even bigger?

This is purely a post asking if anyone knows more. I saw a post somewhere on this and now I just can't find it anymore.

Thanks