1, the first frost is the eighteenth of the twenty-four solar terms. Fight with your fingers; The solar calendar is 210; Salary will be paid every year on the Gregorian calendar 10,123-24 October. The first frost is the last solar term in autumn and the transition from autumn to winter. The first frost solar terms are characterized by cold weather in the morning and evening, hot weather at noon, large temperature difference between day and night, and obvious autumn dryness. Because "frost" is a manifestation of cold weather and large temperature difference between day and night, it is named "first frost" to indicate that "the temperature drops suddenly and the temperature difference between day and night is large". In the first frost season, everything is finished, everything goes to heaven, the sun goes to the ground, and the yin begins to condense. As the saying goes, "the first frost kills a hundred herbs." After the first frost, the plants gradually lost their vitality and the land was desolate. The first frost does not mean "frost", but refers to the sudden drop in temperature and the large temperature difference between day and night. After the first frost solar term, the scene of late autumn is obvious, and the cold air goes south more and more frequently.

2. The "first frost" solar term reflects the climate characteristics of large temperature difference between day and night, obvious autumn dryness and gradually cold weather, which does not mean that it will be "frost" when entering this solar term. In fact, "frost" didn't fall from the sky. The "frost" is the condensation of water vapor on the ground when it meets cold air due to the change of temperature difference. There is no concept of "first frost" in meteorology. Meteorologically, the first frost in autumn is generally called "first frost" or "first frost", and the last frost in spring is called "late frost" or "final frost". The interval from the last frost to the first frost is a frost-free period, and "frost" generally appears in autumn, winter and spring. The solar term "first frost" has nothing to do with "first frost" and is not the same concept.

3. The solar terms in the first frost mainly include the customs of enjoying chrysanthemums, eating persimmons, climbing high and overlooking, and tonic. The first frost season is the turning point of autumn and winter climate, and it is also the transition of the spirit of the sun from being hidden. The key to health care should pay attention to "keeping out the cold outside and clearing heat inside". There is a folk saying that it is better to make up the first frost in winter. In autumn, the spleen and stomach are the foundation of the day after tomorrow. At this time, tonic is appropriate, especially strengthening the spleen and nourishing the stomach to nourish the day after tomorrow.