202 1 99 timetable

202 1 99 timetable 202 1 99 time: 2021March 3-2021March1.

Day 1: March 3, 20021year

The next day: March 4th, 20021year.

Day 3: 202 1 (Scared)

Day 4: March 6th, 20021year

Day 5: March 7th, 20021year

Day 6: March 8, 20021year (Women's Day)

Day 7: March 9, 20021year

Day 8: 202 1 March 10

Day 9: 202 1 March 1 1.

What is the number nine in cold weather? It is the twenty-four solar terms of Han people, which was popular in Wei, Jin, Southern and Northern Dynasties. The climate difference between regions is still different, so each region has several nine songs belonging to each region.

China has been in cold weather for several years since the winter of November. Astronomical experts said that "the Ninth Five-Year Plan" is a more applicable solar term in northern China, especially in the middle and lower reaches of the Yellow River.

From the day of winter solstice, it entered the "number nine", commonly known as "cross nine", and then every nine days as a unit, called "nine". After nine "nines", it happens to be 8 1 day, that is, "nine out", and then spring blossoms.

Why is March 9 the coldest? We know that the earth absorbs the heat radiated by the sun during the day and radiates it at night. In summer, it absorbs more heat during the day and emits less heat at night, so it can retain some heat every day. In winter, less heat is absorbed during the day and more heat is released at night. Not only can you not keep it every day, but you should also use some heat left over from summer.

On the solstice of winter, the direct point of the sun is in the southern hemisphere, and the northern hemisphere absorbs less heat during the day, but fortunately there is still some stored heat. After the winter solstice, the stored heat is less and less day by day. By March 9, the heat stored in the northern hemisphere is the least in a year, so it is the coldest.

That is to say, when the solar heat absorbed by the ground is almost equal to the heat emitted by the ground, the temperature will reach the coldest degree.