Solar terms c brush topic

According to the annual date of beginning of spring, 24 solar terms can be calculated, and the annual date of beginning of spring is calculated as follows:

Every15th day after beginning of spring is a solar term.

Solar term date speed algorithm: general birthday formula -[y× d+c]-l

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

In this century, the C value of beginning of spring is 4.475, and the beginning of spring date of 20 17 is as follows:

[20 17×0.2422+4.475]-[20 17/4- 15]=492-489=3

So the beginning of spring date of 20 17 is February 3rd, as simple as that.