The calendar I help with shows tomorrow (Sept 22, at 7:21 a.m.) as the "Autumn Equinox"...but, I'm proud to say, doesn't actually call it the "first day of autumn". So we are all free to mark the seasons as guided by our individual creeds -- it's the American way!
On a related issue, for some reason the Friends of Nevada Wilderness 2016 calendar shows yesterday, September 20, as the Autumn Equinox. Still shows the time as 7:21 a.m....