What does it mean when the three feet of ice breaks and the beginning of autumn becomes clear?

Three feet of ice is broken, and the beginning of autumn is very clear, which means that the weather is cold and the ground is freezing, the ice is three feet thick, the autumn air is crisp, and the moonlight is exceptionally bright.

Source: Qingche Wanyu's "Enlightenment of Sound and Rhythm": "The ice is three feet thick, and the autumn moon is very bright. Tens of thousands of books can be read by leisurely guests, and a bottle of wine can be poured by old friends."

Translation: It’s freezing cold, the ice is three feet thick, the air is crisp in autumn, and the moonlight is exceptionally bright. Thousands of books are enough for a leisure person to read for a while, and a glass of fragrant wine is waiting for old friends to come and taste it.

Extended information

Appreciation of "Enlightenment of Rhythm":

"Enlightenment of Rhythm" is divided into rhymes, including astronomy, geography, flowers and trees, birds and animals, The virtual and real responses to characters, objects, etc. From single-character pairs to two-character pairs, three-character pairs, five-character pairs, seven-character pairs, to eleven-character pairs, the sounds and rhymes are harmonious and catchy, and you can get training in pronunciation, vocabulary, and rhetoric.

Poetry and couplets are important literary forms in ancient China. They have been passed down from generation to generation for more than two thousand years and still have strong vitality today. "Enlightenment of Rhythm" contains layers of pairs from single words to multiple words, which makes reading it feel like singing. Compared with other three-character and four-character sentences, it has more charm.