20 15 Spring Festival coincides with the rain in 24 solar terms. As the saying goes, what does it mean to pour spring water once in a hundred years?

The Spring Festival is a lunar festival, and the lunar calendar and solar calendar have a wide range of correspondence, and the solar calendar and solar terms have a wide range of correspondence within 48 hours, so the lunar calendar and solar terms have a wide range of correspondence, just like the lunar calendar and solar calendar. The overlapping of the Spring Festival and rainy solar terms is a very small probability event, and the number of occurrences in a century is very limited, that is to say, once in a hundred years. In fact, a person, in his life,