"March 9th" refers to the third "nine days" after the winter solstice, that is, the 19th to 27th days after the winter solstice. "The third nine days after the winter solstice" refers to "March 99", which is also the day when March 99 and April 99 intersect, not "March 99", that is, "March 99" is nine days instead of one day. People say, "it's cold for nine, and it's cold for nine in March." "March 9th" generally appears in the winter from solstice to shock.
Three volts is the general term for initial, middle and final volts. According to the traditional calculation method in China, the third and fourth Geng days from summer to the future are the start dates of the first and second falls respectively, and the first Geng day after beginning of autumn is the first day of the last fall. The length of the dog days is not exactly the same. If the middle section ends after beginning of autumn, it is 30 days. If the middle section ends before beginning of autumn, it will be 40 days (20 days in the middle section).
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