The number of four seasons and eight festivals refers to: the "four seasons" in the "four seasons and eight festivals" refers to spring, summer, autumn and winter; "Eight Festivals" means that there are eight earliest important festivals in the Twenty-four Qi Festivals, namely, the winter solstice, the summer solstice, beginning of spring, long summer, beginning of autumn, beginning of winter, the vernal equinox and the autumn equinox. These eight festivals are the seasons that mark the beginning and end of the four seasons of Yin and Yang, and we usually call them four seasons and eight festivals.

And each rain time refers to: if the weather conditions are divided into cloudy, light rain, moderate rain, heavy rain and sunny, they are represented by the numbers 1, 2, 3, 4 and 5 respectively. So the rainy hours are: 2, 3, 4.