It means that in another year, it is the Millennium season, the swallows are back, and the geese are back; By the autumn equinox, osmanthus is ripe and fragrant. According to the experience of farmers, some poems mentioned in "Twenty-four solar term song" are: Spring rain shakes the valley and spring, summer is full and summer is hot; Autumn, autumn frost, winter snow, winter cold; There is no change in the two festivals every month, with a maximum difference of one or two days; Six in the first half of the year
Twenty-one, the second half of the year is August 23rd; The dates of the two festivals are fixed every month, with a difference of at most one or two.