Which wild goose is "it turns in the early spring, and the rain geese are near the river"

The "wild goose" of "the sun turns in beginning of spring and it rains by the river" refers to "Hongyan", also known as "Dayan". The solar terms of "rain" in ancient China are divided into three periods: "The first period is for Rex to sacrifice fish; Second, wait for Hongyan to come; Third, wait for the grass to sprout. " In this solar term, otters start fishing and put the fish on the shore, as if they were sacrificed first and then eaten; Five days later, the geese began to fly back to the north from the south; In five days, in the "moist and silent" spring rain, the spirit of the sun rises everywhere in the vegetation and begins to sprout. Since then, the earth has gradually begun to show a thriving scene.