What solar terms are called weather?

In summer, the solstice is cloudy and the weather becomes shorter;

The winter solstice is sunny and the sundial begins to get bigger.

The summer solstice on June 2 1 or 22 every year is the summer solstice. At this time, the sun shines directly on the Tropic of Cancer, which is the longest day in the northern hemisphere. Summer solstice was also called "Summer Festival" and "Summer solstice Festival" in ancient times. In the ancient summer solstice, people prayed for disaster and prosperity by offering sacrifices to God. "Zhou Li Chun Guan" contains: "With the arrival of summer, go to local things." Sacrificing to God in the summer solstice of the Zhou Dynasty means eliminating plague, famine and starvation. Historical Records records: "On the solstice of summer, people worship the land with music and dance." As an ancient festival, the summer solstice began in the Song Dynasty, and officials have a three-day holiday. In Liao Dynasty, this day was called "summer solstice", and women entered colorful fans to give each other a legacy (Liao history). In the Qing dynasty, it was also called "summer solstice is a day's transition, and the sun, the next day and the last day were called" three hours ",so people lived cautiously.

Winter solstice, the time is between 0 and 23 of 65438+February 265438+ 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 solstice in winter, the days will get longer day by day. The ancients said this about the winter solstice: As soon as the cathode arrived, the yang began to grow, the sun went south, the day was short and the shadow was long, so it was called "the winter solstice". In ancient China, people attached great importance to the winter solstice and thought it was a grand festival. There is a saying that the winter solstice is as big as a year, and there is a custom to celebrate it. "Han Shu" said: "The sun shines on the winter solstice, and you are long, so congratulations." People think that after the winter solstice, the days become longer and longer and the sun rises. This is the beginning of a solar cycle and an auspicious day, which should be celebrated. The Book of Jin records: "On the winter solstice of Wei and Jin Dynasties, people from all over the world celebrated ... its appearance was not as good as that of Zheng Dan." Explain the ancient emphasis on the winter solstice.

The winter solstice is extremely cloudy, and the cathode gives birth to the sun, so there is a saying that the winter solstice gives birth to the sun. The solstice in summer is the point of extreme yang, and the anode produces yin, so there is a saying that "the solstice in summer produces yin" In winter, the solstice is the shortest and the days begin to get longer. Since then, the days are getting longer, the nights are getting shorter, the sun is getting longer, the yin is fading, and the summer heat is coming and going, until the vernal equinox, day and night are flat, yin and yang are equal, and both cold and summer are available. In this way, as for the summer solstice, the day is extremely long and the night is extremely short, and the yang is extremely strong and the cathode is weak, so the extremes must be reversed; After the autumnal equinox, it is another year to return to the winter solstice.

Sun shadow. Sundial: An instrument for measuring time through the shadow of the sun.