I always thought it was really dumb that the winter solstice is the first day of winter. In my view, the shortest day of the year should be precisely the midpoint of winter. all of the shortest days should be grouped together as winter. Instead, the first day of winter is, in essence, the beginning of the march towards more and more daylight.
My way is better. The rest of the world seems to agree.
btw, happy solstice!