It’s interesting that people often think this is the day when the sun sets the earliest and rises the latest.
But that’s not true!
Because of peculiarities of the Earths orbit, the sun actually sets earliest about five days before the solstice. But it keeps rising a bit later each day, and eventually rises latest about five days after.
The combination of the two effects gives us the solstice, the shortest day of the year!
You have a website for that?
Actually the earliest sunset is usually Dec 7, two weeks before the solstice.