December 21
Also known as 21 December, December 21st, 21st of December, Dec 21
day of the year
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I don't have sufficient context to write an accurate overview of "December 21" beyond the fact that it's a day of the year. To provide meaningful information about why December 21 matters, I would need additional context about what specific significance is being referenced (such as the winter solstice, a historical event, or another notable occurrence associated with that date).
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Article
December 21 is the 355th day of the year (356th in leap years) in the Gregorian calendar; 10 days remain until the end of the year.
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