According to Charlie Alschiemer(sp.?) of Deer & Deer Hunting Mag. the moon phase is a big factor each year. So each hunting season should see a change in dates for the various phases of the rut. And I think there may be something to that, but I'm liking a falling moon more and more each year.
That being said, after 20 years on the farm we own, November 20, give or take, has been the time to be in our woods for the BIG ones. I haven't been too lucky in the harvest end, but the sign is always outstanding and the action very thrilling.