Which day is September 9, 2019? The number of cold days represents the cold winter months. The arrival of September 9 means that we enter the coldest time. Therefore, we must do a good job in cold prevention and warmth preservation, so which day is the start of nine days?
Which day is September 3, 2019
Which days are September 9, 2018: January 9, 2019 - January 17, 2019 'September 3' refers to the third 'nine days' after the winter solstice, that is, the 19th to 27th days after the winter solstice.
The Chinese lunar calendar has the term '99', which is used to calculate the seasons. The method of calculation is from the winter solstice (from the beginning of the winter solstice, it is called "jiaojiu", which means the beginning of cold), every nine days is one 'nine', the first nine days are called '19', the second nine days are called '29', and so on, until '99', that is to say, the ninth nine days, when the number reaches 9981. By this time, the winter was over and spring came.
When is the September 3, 2019
The first day of September 39: January 9, 2019
39 the second day: January 10, 2019
39 the third day: January 11, 2019
39 the fourth day: January 12, 2019
39th day 5: January 13, 2019 (Laba)
September 6: January 14, 2019
September 7th: January 15th, 2019
September 8: January 16, 2019
39th day: January 17, 2019
Why is September the coldest time
Because according to the law of nature, the earth absorbs the heat of solar radiation during the day and emits it at night. In summer, it absorbs more heat in the daytime and emits less heat in the evening. It can retain some heat every day. In winter, it absorbs less heat in the daytime and emits more heat in the evening. Not only can it not be retained every day, but also the heat retained in summer can be used up.
On the day of the winter solstice, the direct sunlight is in the southern hemisphere, while the northern hemisphere absorbs less heat during the day. Fortunately, there is still some stored heat. After the winter solstice, the heat stored in the ground is less than that in a day. By the time of "March 9th", the heat stored in the ground has been exhausted. As long as the cold air comes, it will be freezing, which is the really coldest season.
That is to say, when the sun's heat absorbed by the ground is almost equal to the heat emitted from the ground, the temperature reaches the coldest level.