December 21 is the 355th day of the year (356th in leap years) in the Gregorian calendar. There are 10 days remaining until the end of the year.
In the Old Age, this day is usually the winter solstice, making it the shortest day of the year, in the northern hemisphere & the summer solstice, making it the longest day of the year, in the southern hemisphere.
- 2012 — 2012 Catastrophe: a large unknown projectile crashes down in the Pacific Ocean, causing an apocalyptic catastrophe that nearly kills all of humanity
- 2012 — The entire population of Earth save about approximately 65 people, to which about somewhere between 100 & 200 survived the initial disaster & died from the aftermath of the catastrophe in the following months.