The calendar of several years is exactly the same as 1996.

Accurately speaking, every 19 years, there are basically close to 1 times, which is not absolute, and sometimes there is an error of 1 day. For example: Gregorian calendar: Monday, October 26th, 2009/kloc-0; Gregorian calendar:1978; 1Thursday, October 5th; Lunar calendar: the first day of the first month of the Year of the Ox; Gregorian calendar: June 26th, year of the snake; 1990; 1Saturday, October 27th. Gregorian calendar: 1 997 65438+1Sunday, October 5th, Lunar calendar: the first month of the Year of the Horse1Sunday, Lunar calendar: the earth's orbit around the sun on the 26th of the winter month of the Year of the Rat is elliptical, and it moves slowly at the perihelion (vernal equinox and autumnal equinox), and the interval between the two solar terms can reach 31. On the other hand, the average lunar new moon is only 29.5306 days, including 29 days in the first lunar month and 30 days in the second lunar month. In the China lunar calendar, 24 solar terms are divided into 12 solar terms and 12 neutral terms. In this way, there will be such a situation: in some months (usually abortion), the last breath has passed at the beginning, and the next breath has not come at the end. Why is a lunar month not neutral? The results show that the average interval between two neutral gases is 365.2422÷ 12=30.4368 days, then 30 or 3 1 day. The lunar calendar adopts the method of 19 plus 7 leap months, that is, the "19 year 7 leap method", which well coordinates the return year and the lunar year, so that the New Year's Day (Spring Festival) of the lunar calendar is always kept in late winter and early spring. The ancients called 235 new moons "leap weeks". For example, 200 1 (New Year's Eve) is May 21(April 29), and the first day of the next lunar month is May 23. However, this lunar month ends on June 20, and the summer solstice is June 2 1, so this lunar month is not "neutral", it falls in the fourth month of the lunar calendar. This year's vernal equinox is on March 20th (February 30th), the first day of the next lunar month is on March 2nd1,and ends on April18th, and the third day is in Grain Rain on April 20th. In this way, the month after February of this year's lunar calendar without "neutral gas" is designated as leap February. According to this leap rule, it will leap in July 2006, May 2009, April 20 12, September 20 14, June 20 17 and April 2020.