December solstice – Wikipedia

The December solstice, is the solstice that occurs each December – typically on Dec 21, and can vary ± 1 day according to the Gregorian calendar.In the Northern Hemisphere, the December solstice is the winter solstice, whilst in the Southern Hemisphere it is the summer solstice.It is also known as the southern solstice

https://en.wikipedia.org/wiki/December_solstice