In Liu Yi, what do you mean by "the sky under the sun" and "the sky on the moon"?

The moon breaks, hedging the moon breaks. For example, the peak at noon, rest at noon; Ugly don't rush, ugly month is not broken; The ugly moon is broken, etc.

The sky is empty for two days out of ten days. Look at the perpetual calendar. For example, on the tenth day of Jiazi, there are two places above Jiazi branch, and if these two places are not arranged, they are empty, and the ugly day is also on this tenth day, which is also empty. Counting from the day when Tianganjia started.