On which day does the solar term begin or end?

From the standard point of view, beginning of spring started and the Great Cold ended. Strictly speaking, it has no beginning and no end, and it goes on and on.

The beginning of spring every year is usually around February 4. Some years will also be the 3rd or 5th, for example, 202 1 this year is February 3rd.

The severe cold is generally around 65438+1October 20th.

The twenty-four solar terms actually correspond to the solar calendar. In other words, a circle of 24 solar terms is actually a real circle of the earth around the sun, which is one year.

The ancients knew for a long time that there were 365 days in a year. History books record that there are 366 days in a year, which is almost the same as the 365 days we say now.

So in the 24 solar terms, each solar term is 15- 16 days. In this way, one lap is 365 days.