What do you mean by the mid-winter sun rising?

It means the first day (the first day) of the second month (that is, November of the lunar calendar).

The winter solstice, also known as midwinter, refers to the second month of winter, that is, the second month, which includes two solar terms: heavy snow and winter solstice. Corresponding to the lunar November.

Shuori refers to the first day of each month. The first day of every month is the first day of the lunar calendar in China. Starting from Pingdan (just at dawn), crow and midnight, there are three algorithms. On that day, the moon and the sun are equal on the zodiac, which is called the new moon.