December 21 is the 355th day of the year (356th in leap years) in the Gregorian Calendar. There are 10 days remaining.
- A solstice occurs on or very close to this date.
December 20 - December 22 - November 21 - January 21 - more historical anniversaries
See Also: January, February, March, April, May, June, July, August, September, October, November, December