Rainwater solar terms, the flying direction of geese

In the rainy season, geese begin to fly back to the north. According to relevant information, after five days of rainy solar terms, geese began to fly back to the north from the south. It is wrong to write "Wait for Hongyan" in some ancient books. Hongyan's hometown is in Siberia. Every autumn, Siberia begins to be covered with snow and ice, and geese fly to grasslands, rivers and lakes in southern China for the winter. The following spring, when the weather in the south became warmer, they began to fly back to Siberia from the south to breed. Therefore, the destination of Hongyan in rainy season is "going north" rather than "coming south".