Traditional Culture Encyclopedia - The 24 Solar Terms - Why is it so possible for the lunar calendar to leap into April?
Why is it so possible for the lunar calendar to leap into April?
The trajectory of the earth's rotation around the sun in an elliptical orbit is as follows:
As can be seen from the figure, the time in winter is shorter than that in summer (the setting of the twenty-four solar terms in the China lunar calendar conforms to Kepler's law of celestial motion), that is to say, the time interval between two adjacent solar terms in the summer calendar is longer than that between three adjacent solar terms in spring, autumn and winter.
Twenty-four solar terms are divided into 12 solar terms (beginning of spring, Jingzhe, Qingming ...) and 12 neutral words (rain, vernal equinox, Grain Rain ...).
The setting method of lunar leap month is to regard the month with only solar terms and no neutral atmosphere as leap month.
The time interval between two adjacent solar terms in summer is relatively long, so in 29 and 30 days, only the solar terms are neutral, which makes the leap probability in May, April and June even greater.
In the past 180 years, there were 15 leap in May, 12 leap in April (including this year), 9 leap in June, 8 leap in March, 8 leap in July, 6 leap in February and 6 leap in August.
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