Beginning of spring time problem

Just checked on the central weather forecast website and got the following answers. I believe I can answer the landlord's questions ~ ~

Why are there two versions of this year's beginning of spring date 2009-02-03 08:30:4 1 Source: Beijing Evening News.

Is it beginning of spring on February 3rd or beginning of spring on February 4th? Careful readers find that this year's beginning of spring date has two versions, one was written on February 3rd, and the other was written on February 4th.

Dr. Wang Yumin, an astronomy expert at Beijing Ancient Observatory, said that the reason for these two "beginning of spring" dates is the time difference.

The twenty-four solar terms reflect the movement of the sun in one year, which is divided according to the position of the sun on the ecliptic (that is, the orbit of the earth around the sun). Depending on the sun starting from the vernal equinox (longitude zero, at this moment the sun shines vertically on the equator), every advance of 15 degrees is a solar term; After running for a week, I returned to the vernal equinox. The vernal equinox is a tropical year, which is 360 degrees, so it is divided into 24 solar terms.

The dates of solar terms are relatively fixed in the solar calendar. The time in beginning of spring this year is 0: 50, that is, just after the demarcation point of the day. If calculated according to Beijing time, it should be February 4, that is, the tenth day of the lunar calendar. According to the time in Taiwan Province Province or other regions, it is still February 3rd. Because the calendars and desk calendars on the market are printed by different companies and enterprises, including Taiwan-funded enterprises, or according to the local time in Taiwan Province Province, there is a problem of holding the Spring Festival Evening for one day.

It is understood that from 2005 to 2009, the date of beginning of spring was on February 4th, which also shows that the dates of the 24 solar terms are basically fixed in the solar calendar.

He, vice chairman of the Chinese Folklore Society, also said that there is nothing wrong with two different beginning of spring times in the calendar, but there is a time difference in beginning of spring due to geographical influence. This year, beginning of spring time in Beijing is 0: 50, just after the solar term, so it should be February 4th. Because of the time difference between Taiwan Province Province and Beijing, it is still February 3rd.