In the long summer, the sun is located at 45 degrees of the yellow meridian, which generally coincides with May 5 to 7 of the new calendar every year. This year's long summer is May 5; In summer solstice, the sun is located at 90 degrees of the yellow meridian, and the time is from June 2 1 day to June 22.

2. The difference between long summer and summer solstice climate.

In the long summer season, summer drought often occurs because of the late start of heavy rain and less rainfall in the western and central parts of the basin. During this period, just like harvesting crops in early spring in the basin and planting crops in Da Chun, special attention should be paid to the influence of changeable weather. Harvest in time in sunny days and sow in rainy days. Even in rainy days, the harvest in Koharu should be protected from germination, mildew and drought, and the harm of low temperature below 20℃ to early rice should be prevented.

During the summer solstice, it is the solar term with the largest annual rainfall in the eastern part of the basin, which is often controlled by subtropical high in the future, resulting in summer drought. In order to enhance drought resistance and win a bumper harvest in agriculture, it is an important measure to capture and store pre-dormant rainwater in these areas. After the summer solstice, the ground is heated strongly and the air convection is strong, and thunderstorms are often easy to form in the afternoon to evening. This kind of hot thunderstorm comes and goes, and the rainfall range is small. People call it "dividing fields in summer and rain". There are also some plain areas with heavy rainfall to take flood control measures, keep abreast of the weather changes in the next few days, and harvest crops in time.