Count to nine, from which day?

1 .9 This figure is calculated from the winter solstice of Renren. Count a "nine" every nine days until the peach blossoms bloom at nine o'clock on the eighty-first day, and the weather will be warm.

Ninety-nine-year-old Jiehan Song, popular in China from winter solstice, commonly known as "Ninety-nine-year-old Song", vividly records the changes of climate and phenology between winter solstice and vernal equinox, and also expresses some laws of farming activities.

2. Invasion means counting down from "Summer Solstice Day", and then entering an ambush on the third "Geng Day". The "Geng Day" here refers to the days prefixed with "Geng" in the ancient "Ganzhi Jiri Law".

Voltage is divided into initial voltage, intermediate voltage and final voltage, which is called three volts. The dog days are the hottest period of the year, because the nights are getting shorter and shorter, the days are getting longer and longer, and the sunshine is close to direct sunlight. But the summer solstice is not the hottest time, because at this time, a large part of the heat absorbed by the ground radiates at night. But it absorbs more heat and dissipates less heat every day, and it gets hotter every day. It will be the hottest when it reaches three volts in about 20 days.