Is the WINTER SOLSTICE! (I have seen both dates referenced in terms of this year). This day is the official beginning of winter and is also the longest night/shortest day. So although here in Canada we are just starting to brace for the cold weather ahead, we can already start looking forward to a slow but ongoing increase in the length of time Mr. Sun graces us with his presence each day.
Interestingly since the solstice is technically when “when the axial tilt of a planet’s polar hemisphere is farthest away from the star that it orbits” (thanks Wikipedia), the solstice is actually a moment in time, although we tend to think of it as the full day.
So there you have it, learned something new today (maybe)!