December 21 is the 355th day of the year in the Gregorian calendar. There are 10 days remaining until the end of the year.
In the Northern Hemisphere, December 21st is the first day of Winter and the shortest day of the year. In the Southern Hemisphere, December 21st is the first day of Summer and the longest day of the year. (Source: Wikipedia)
Please see our short introduction video.
Select your preferred language