September 22 is the Autumnal Equinox. They discovered that the human nervous system typically undergoes measurable perturbations during late September and in mid-March. More recent studies found that violence tends to spike prior to the autumnal and vernal equinoxes as well as shifts in blood chemistry. The important point to keep in mind is that such phenomena tell us when and not why crises might occur. Scientific studies demonstrate that subtle shifts in human chemistry occur on this date.

Source: Forbes September 22, 2017 19:41 UTC