When Is December 21 2024. The first day of winter in the northern hemisphere is marked by the winter solstice, which occurs on saturday, december 21, 2024, at 4:21 a.m. The winter solstice — the exact moment when the sun appears farthest south in the sky — happens at 4:20 a.m.
On the 51st week of 2024 (using us standard week number calculation). Daily calendar for saturday, december 21, 2024 ember days traditionally observed by some christian denominations, each set of ember days is three days, kept on a.