Is the winter solstice based on the solar or lunar calendar? When is the annual winter solstice solar calendar and lunar calendar?

The winter solstice is a very important solar term in the China lunar calendar. As early as 2500 years ago, during the Spring and Autumn Period, China observed the sun with the earth, and determined the winter solstice, which was the earliest of the 24 solar terms. The time starts from Gregorian calendar 65438+February 2 1 to 23rd, and the sun reaches longitude 270. This day is the shortest day and the longest night in the northern hemisphere all year round.

The winter solstice is the first day of nine cold days. As the saying goes, "the winter solstice is nine years old", and it begins to count nine days. If nine days is regarded as a nine, winter will pass, which is called nine days.

The ancients attached great importance to this solar term, and it was recorded in the Book of the Later Han Dynasty: "Before and after the winter solstice, gentlemen lived quietly, refused to listen to politics, and chose auspicious days to save trouble." So on this day, the imperial court had a holiday, the army was on standby, the frontier fortress was closed, the business trip was closed, relatives and friends sent meals to each other, visited each other, and had a "quiet" holiday happily. (holding)