Today is the shortest day of the year: winter solstice.
Here in the middle of
North America, winter solstice will arrive tonight at .
The sun set today, sinking below the horizon the farthest south that it ever does. It then appears not to move for a couple of days. Then on the 3rd day, December 25th in some parts of the world, it starts back north, each day successively sinking below the horizon further and further north.
Bringing back longer days and warmer days.
The Romans had a 3-day festival to celebrate this. They called it the Festival of the Invincible Sun.