In the past 10 years, when did spring begin?

Generally, the exact solar term time is known through the solar calendar, and there is a solar term date speed algorithm:

General formula of longevity -[y× d+c]-l

Y= year, D=0.2422, L= leap year, and C depends on solar terms and year.

The sentence "beginning of spring begins at 3 o'clock on the 5th" means that if you want to know when beginning of spring is this year, you should first know the beginning of spring time last year. For example, I want to know the beginning of spring time of 1998. As long as you know the beginning of spring time of 1997, you can push it. 1997 beginning of spring time is1February 27th, 996 in Yin Shi. According to the Song formula, it takes five days and three hours. In 1997, the abortion was six days. (Because the abortion was in February 1996, but the 27th was handed over to beginning of spring, so this day is counted as 65438+February 27th,15th, 3:16th. Note: If there was a leap month last year, the actual start time of spring could be one month earlier. Actually, it was on the eighth day of the first month of 1998, and spring began.