Longevity formula

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.

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2)

Beginning of spring date calculation formula: [Y*D+C]-L

Interpretation of the formula: the last two digits of the number of years are multiplied by 0.2422 plus 3.87, and the whole number is subtracted from the number of leap years. 2 1 century c value =3.87, and in the 22nd century c value =4. 15.

For example, the calculation steps of beginning of spring date in 2058 are [58× .0.2422+3.87]-[(58-1)/4] =17-14 = 3, so beginning of spring date is February 3.

References:

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