What are the 24 solar terms in China based on?

It was customized by the ancients according to the solar cycle. In ancient times, we were a very developed society in agricultural production, but one of the disadvantages of agricultural production was that we had to rely on the weather to eat. People observe the sky and the sun for a long time, and naturally explore certain laws to guide people's agricultural production practice. In this way, we can grasp the change of season and the timing of sowing.

0 1 and 24 solar terms are to supplement the deficiency of the lunar calendar.

Our traditional calendar is the lunar calendar, which is unusual. It is made according to the period of the moon. For example, the moon is curved on the first day and the thirtieth day, and it will become round around the fifteenth day. This process was discovered and recorded by the ancients and created into a calendar. But people's work has nothing to do with the moon, so they have to add 24 solar terms and work according to the sun.

02 and 24 solar terms are the crystallization of the wisdom of working people.

In ancient times, there was no Gregorian calendar. How do we distinguish the four seasons? This is a very complicated problem. People divide the four seasons according to the change of the sun's height and the temperature difference, and in the process of observing the sun's altitude angle, they constantly find out when the sun is suitable for sowing and harvesting, and gradually formulate 24 solar terms, which are inseparable from the daily life of working people.

How did the ancients determine the 24 solar terms?

People first observed the length of the shadow on the sundial. At noon, when the shadow of the stick is the longest, it is the solstice of winter. Since then, the length of the shadow has been recorded every day, and the shortest shadow is the summer solstice. Then according to the length of this time, the cycle of 24 solar terms was formulated. In fact, the 24 solar terms are what we said in ancient times? Solar calendar? And the modern general? Gregorian calendar? There is still a difference.