The years in which leap October occurs are: 1623, 1775, 1870,1984,2166,2318,2386,2488. 308 1 year, 3263, 34 15 years, 3453, 3483, 3578, 3597 and 3635 years.
3673, 3855, 3950, 3969, 4045, 4064, 4083, 4 178, 4227, 4360, 4436, 4447, 4455, 4542 and 4550.
Extended data:
The lunar leap month is to coordinate the contradiction between the tropic year and the lunar year. First of all, we should know that the total length of the tropic year is 365.2422 days, and the length of the first lunar month is 29.5306 days. 12 lunar months make up the lunar year, with a length of 29.5306× 12=354.3672 days, which is 10.88 days less than the regression, and about1/kloc-0 per month less than 0.9 1 day.
Accordingly, if the Spring Festival in one year of the lunar calendar is a snowy winter, the Spring Festival in the next year will be 1 1 day earlier than the season, and 16 Lunar New Year will appear in the hot summer.
If the lunar year consists of thirteen lunar months, the length is 29.5306× 13=383.8978 days, which is more than the tropic year 18 days. If the calendar is made according to the above regulations, there will be a strange phenomenon that the weather is inconsistent with the calendar and the time order is disordered and reversed-this is contradiction.
In order to overcome this shortcoming, our ancestors found the method of "leap month" on the basis of astronomical observation, ensuring that the first month to March is spring, April to June is summer, July to September is autumn, and October to December is winter, while ensuring that the first year of the lunar calendar is in late winter and early spring.
The mid-year month of the lunar calendar is based on the length of 29.5306 days in the first lunar month, so the big month is 30 days and the small month is 29 days. In order to ensure that the first day of each month (the first day) must be a new moon, the arrangement of large and small months is not fixed and needs to be determined through strict observation and calculation.
Therefore, it is very common to be big or small for two consecutive months in the lunar calendar, and even there are rare exceptions, such as 1990 in which March and April are small, and 9, 10,1,1February are big for four consecutive months.
Baidu encyclopedia-leap in October