1June 974 19 is the first day of the lunar calendar.

1June 974 19 is the 29th leap month of the lunar calendar.

1974 has a leap month, April leap month. Leap April begins on the first day of leap April 1974 and ends on June 29th 1974.

Leap moon refers to a phenomenon in the lunar calendar. The lunar calendar arranges a big moon and a small moon according to the full moon of the moon, that is, the moon. The length of a moon is 29.5306 days, which is the cycle of the moon's profit and loss.

According to the lunar calendar, the big moon has 30 days and the small moon has 29 days, so one year is 12 months * * 354.672 days, while the lunar months have no seasonal significance, so twelve months constitute the Han calendar, with a length of 29.5306× 12 = 354.3672 days, which is 365 days older than the return. 18606.6660 17 Only after17 years, the date of the lunar calendar will be reversed in the same season.

For example, one year's New Year was spent in the snow, 17 years later, it will be a New Year's Eve. The use of such a calendar naturally cannot meet the needs of agricultural production. Therefore, since the Qin and Han Dynasties, the lunar calendar in China has been in parallel with the twenty-four solar terms, which are used to guide agricultural production.

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 the contradiction.

In order to overcome this shortcoming, our ancestors found out 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, and at the same time ensuring that the first year of the lunar calendar is in late winter and early spring (all of the above refer to lunar months).