In the long summer, goose feathers live on birds, and birds fly around.

In the long-term production practice, the working people in northern China have summed up many agricultural proverbs related to solar terms, such as: "When the sun shines in spring, the rain flows smoothly", "When the crow wakes up, the spring water dries up", "When the wheat is busy in Qingming, Grain Rain farms", "When the goose feather grows in summer, the birds come everywhere" and "When the summer is not hot, it is dog days". These agricultural proverbs vividly reveal the relationship between weather, phenology and farming in northern China, especially in northeast China, which is of great significance in agricultural production.