An actual year, solstice to solstice, averages 365.242 days rather than 365 days. So after three 365-day calendar years the solstice happens 17+ hours later than it did-- then after the following 366-day year it's almost back where it started. read more
The December Solstice is either on Dec 20, 21, 22 or 23. It is the Winter Solstice in the Northern Hemisphere and the Summer Solstice in the Southern Hemisphere. read more
The winter solstice (or hibernal solstice), also known as midwinter, is an astronomical phenomenon marking the day with the shortest period of daylight and the longest night of the year. In the Northern Hemisphere this is the December solstice and in the Southern Hemisphere this is the June solstice. read more