When is the longest night of the year?

In ancient times, the earth was used to observe the sun, and the time of winter solstice was generally between 65438+February 2 1 ~ 23 in Gregorian calendar every year. The winter solstice is the year with the shortest day and the longest night in the northern hemisphere. After the winter solstice, the days will gradually become longer, and the climate in various places will enter the coldest stage, which is often called "entering the ninth".

Extended data:

Among the 24 solar terms in a year, the most important festivals and festivals that mark the beginning of each season and a year and a half are "four o'clock and eight o'clock", namely beginning of spring, Spring Equinox, Long Summer, Summer Solstice, beginning of autumn, Autumn Equinox, beginning of winter and Winter Solstice. At this "four o'clock and eight o'clock", it is both a solar term and a festival for the masses. There are only two festivals, the winter solstice and the summer solstice.

As a traditional national festival, the winter solstice can be inherited by people for a long time and given fresh vitality, which is mainly manifested in the purpose of respecting the world, remembering ancestors, celebrating harvest and gaining new life, and looking forward to all the best in the coming year. Investigating the origin, development and evolution of the winter solstice festival, we can see that it has multiple functions.

Reference: People's Network-Solar Terms and Winter Solstice: The weather and personnel urge each other, the winter solstice is sunny, and spring is coming again.