Later today it is the December solstice. Darker and colder in the north and brighter and warmer in the south; darker/lighter in terms of time of course.
The solstice, thanks to the tilt of the Earth the Sun appears to reach its most southern point before starting to move north once again until June when the northern point is reached.
Last year I wanted to put a stick or some other such thing out to mark the point of the shadow. I did that, mowed it over before the June Solstice. This year the solstice occurs after sunset.
The time of the solstice is 22:23 UTC / 13:27 ET today – 21 Dec 2018.
The day of the December solstice is NOT always on the 21st. Why? See here.