Calculation Method for the beginning of the lunar calendar in spring, summer, and autumn

The calculation method of the Lunar New Year, the summer, the autumn, and the winter is recorded here:

Laichun accurate time calculation method

Formula: [y * D + C]-l

Explanation of the formula: the second digit of the number of years is multiplied by 0.2422 plus 3.87, And the integer is used to subtract the number of leap years. 21 Century C = 3.87, 22 century C = 4.15.

Example: The calculation procedure for the spring date of January 1, 2058 is [58 ×. 0.2422 + 3.87]-[(58-1)/4] = 17-14 = 3, then the spring of January 1, February 3.

If you want to simplify it, you will get Twenty-four Solar Terms in the next year. You just need to calculate one solar term every 15 days. The error is correct.

Continue to calculate if there is no error:

Calculation Method of lixia:[Y * D + C]-l

Explanation of formula: Y = second digit after the number of years, D = 0.2422, L = leap years, 21 Century C = 5.52, 20century = 6.318

For example, the date of the summer in 2088 is [88 × 0.2422 + 5.52]-[88/4] = 26-22 = 4, and the date of the fifth month is the summer [1].

Exception: the calculation result of June 1 is plus one day.

Why is it sometimes in May 5, but sometimes in May 6? It mainly depends on whether the West calendar is a leap year. If you want to easily write down it, [1] You only need to know the year of the Olympics.

Calculation Method of liqiu:

Calculation Formula of the Beginning autumn Date: [y * D + C]-l

Explanation of formula: Y = the second digit after the number of years, D = 0.2422, L = the number of leap years, 21 Century C = 7.5, 20 century = 8.35.

For example, the autumn date of March 2088 is [88 × 0.2422 + 7.5]-[88/4] = 28-22 = 6, and the autumn day is the autumn day.

Exception: the calculation result of June 1 is plus one day.

Calculation of the Winter Date [y * D + C]-l

Explanation of formula: Y = the second digit after the number of years, D = 0.2422, L = the number of leap years, 21 Century C = 7.438, 20 century = 8.218.

For example, the winter of January 1, 2088 = [88 × 0.2422 + 7.438]-[88/4] = 28-22 = 6, the sixth day of February 11 is the beginning of winter.

Exception: the calculation result of June 1 is plus one day.

Calculation Method for the beginning of the lunar calendar in spring, summer, and autumn