First, it's a cold day in Sanqiu: This sentence means that after the summer and solar terms, the weather gradually turns cold, and the chill every day makes people feel as if it is late autumn. This is because the summer heat marks the beginning of autumn, the temperature gradually drops, and the weather gradually turns cold.

Second, 18 pots in the summer, which means watering frequently: this sentence means that after the summer solar term, it is necessary to water and irrigate the farmland frequently to maintain the humidity of the soil. This is because after the summer solar term, the weather is gradually dry, the rainfall is reduced, and the soil moisture is easily lost, so it is necessary to water frequently to keep the soil moisture.

Third, the summer does not head, and the Millennium does not bow: This sentence means that if the crops have not headed after the summer solar term, they will not bow before the Millennium solar term. This is because after the summer solar term, the temperature gradually drops, and the growth rate of crops gradually slows down, but they still need some time to heading. If they haven't headed yet, they won't bow their heads before the Millennium solar term.

Fourth, the summer radish and white dew vegetables: This sentence means that after the summer solar term, the timing of planting radish is the most suitable, and after the white dew solar term, the timing of planting vegetables is the most suitable. This is because after the summer solar term, the temperature drops gradually, and radish needs a certain low temperature to grow, so the timing of planting radish is the most suitable. After the Millennium solar term, the temperature drops gradually, and vegetables need a certain low temperature to grow, so the timing of planting vegetables is the most suitable.

The origin of the twenty-four solar terms

1 As early as ancient times, farmers in China began to observe seasonal changes and farming time according to the positions of the sun, moon and stars. They found that there are 24 special moments in the orbit of the sun around the earth every year, which are closely related to climate change and agriculture. So, they divided and named these 24 moments, forming 24 solar terms.

2. Each of the 24 solar terms has its own unique name and characteristics. For example, the vernal equinox means the beginning of spring, the autumnal equinox means the beginning of autumn, the winter solstice means the coldest in winter, the summer solstice means the hottest in summer, and so on. These solar terms not only play an important guiding role in farmers' agricultural activities, but also provide reference and basis for people's life and holiday arrangements.