1998 The third day of the fifth lunar month is the day of the new calendar.

The lunar calendar (commonly known as the lunar calendar) has seven leap months every 19, and the first month between two winter solstices is a leap month. There is only a continuous relationship between leap month and month, and there is no repetition. Traditional festivals are annual (whether there is a leap month or not), and the leap month of a month does not repeat for the second time. For example, in the year of Wuyin (1998), there is a leap in May, and after the Dragon Boat Festival, there is no need to leap in May.

Two days before the Dragon Boat Festival, that is, the third day of May, is the Gregorian calendar1May 28th, 998, Gemini.

Why is there a leap month? The reason for this is the following：

The "month" in the calendar is the new moon, that is, the period of the moon (lunar calendar), which adopts the lunar calendar, such as the Islamic calendar;

The "year" in the calendar is the tropic year, that is, the cycle of the four seasons, that is, the direct point of the sun returns to the tropic year, and this year is the solar calendar, such as the western solar calendar, that is, the current Gregorian calendar (commonly known as the Gregorian calendar in the mainland);

The lunar calendar, such as the China lunar calendar (summer calendar, commonly known as lunar calendar in mainland China), takes into account both the lunar calendar and the tropical year.

However, a tropical year (seasonal cycle) is not completely equal to 12 lunar months, so we should strive for a multi-year average that is very close to them (otherwise the Spring Festival will be celebrated this winter, and it will be summer in a few years), and roughly 19 tropical years is equal to (19 times 12 plus 7).