December 21
December 21 is the 356th day of the year in the Gregorian calendar; 10 days remain until the year's end. It falls in winter (northern hemisphere) and under the astrological sign of Sagittarius.
External references
Curated jump-off points to the major almanacs, encyclopaedias and primary sources for this date.
Astronomy
On December 21 the Sun's declination is approximately -23.4°. At this latitude the Sun is south of the celestial equator, giving the Northern Hemisphere shorter days than nights.
For specific rise/set times at your location, see the U.S. Naval Observatory, or the NASA APOD archive for any imagery published on a December 21.
Position in the year
Holidays & observances
No widely-observed holidays catalogued for this day in our base set. See the external almanacs above for region-specific observances.
Events
A selection of widely-documented historical events that took place on this date. Years marked BCE follow standard astronomical convention.
No events currently catalogued for this day. External references may have more.
Notable births
No births currently catalogued for this day. External references may have more.
Notable deaths
No deaths currently catalogued for this day. External references may have more.
Numerical & calendrical curiosities
| Day-of-year (356) | 2^2 × 89 · composite (no) |
|---|---|
| Days remaining (10) | 2 × 5 |
| Date code DDMMYYYY | 21122026 · next palindrome year: 2112 |
| Sun declination | -23.43° (Cooper approximation) |
| Distance from solstice | 1 days |