This morning the earth crossed the point in orbit marking the Winter Solstice. For those of us in the northern hemisphere this is when we are furthest from the sun.
This also marks the shortest day of the year. The days get longer starting NOW.
Christmas (the word is a contraction of "Christ’s mass") is most likely celebrated on December 25 because that was the day of the Winter Solstice on the Julian calendar—a calendar introduced by Julius Caesar in 46 B.C. Cultures around the world have various ways of marking this day. The actual birth day of Christ is unknown--even the year is uncertain.
I have to confess, this is not my favorite time of year, though I am grateful for the holidays to lighten the mood.