Practice three or nine in winter and three volts in summer. Which one are you talking about?

"March 9th" refers to the third "nine days" after the winter solstice, that is, the 19th to 27th days after the winter solstice. There is a saying "Jiujiu" in the China lunar calendar, which is used to calculate the seasons. The calculation method is from the solstice of winter (counting from the solstice of winter, which means the beginning of cold), every nine days are called a nine, the first nine days are called a nine, the second nine days are called a 29, and so on until the ninth nine days, when the number reaches 998 1 day.

"Dog days" come from the summer solstice (June 2 1 or 22), when the third Geng Day was the first day (with ten days), the fourth Geng Day was in the middle (with ten days in some years and twenty days in some years), and the first Geng Day after beginning of autumn (August 7 or 8) was dog days with ten days. Rainy days are from mid-July to mid-August in the solar calendar.

Extended data

All the year round, spring, summer, autumn and winter, 24 solar terms, cycle after cycle. Twenty-four solar terms, harmony between man and nature, adhering to the vitality of heaven and earth, regulating human meridians, and determining seasons according to the growth cycle of animals and plants, are the most abundant and scientific calendars in the world.

Sima Qian once brilliantly pointed out: "Spring is spring, summer is long, autumn is long, and winter storage is a great classic of this world, but it is rich and undisciplined." Therefore, people should know how to adapt to climate change, effectively safeguard their bodies and resist diseases.

Reference link 24 solar terms and health _ Baidu Encyclopedia