How many years can the lunar calendar and solar calendar overlap?

Generally speaking, the lunar calendar is slower than the solar calendar, but due to the irrationality of celestial bodies, it is difficult to determine the lunar calendar and the solar calendar by calculation.

How long does it take for the calendars to completely coincide? The shortest may be 19, or 19 is the Gregorian calendar and the Gregorian calendar may be completely coincident.

It may also be approximately coincident, with a difference of-two days. If the first year 19 does not coincide, the second year 19 may be heavy.

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Lunar calendar is one of the traditional calendars in China, also known as lunar calendar, ancient calendar, Han calendar, yellow calendar, summer calendar and old calendar.

In astronomy, it mainly refers to the calendar arranged according to the phase period of the moon, with the moon circling the earth as January, that is, the first month of the lunar calendar as the basis for determining the calendar month, and a year is a calendar of twelve calendar months. In the process of calendar development and evolution, the appearance of 24 solar terms was used to guide agricultural production scientifically, forming the lunar calendar. Although the lunar calendar and the lunar calendar are commonly called the ancient calendar, the Han calendar, the summer calendar and the old calendar, there are still differences between the lunar calendar and the lunar calendar. The traditional summer calendar is actually a kind of yin-yang calendar.

The lunar calendar determines the moon according to the law of its movement: the orbit of the moon is called the white road, and both the white road and the ecliptic are two great circles on the celestial body, which intersect at five degrees and nine minutes. The moon goes around the earth and appears on the ecliptic twice, which lasts for 7 hours and 43 minutes 1 1.5 seconds on the 27th, and is called "Stellar Moon".

Only when the moon revolves around the earth, the position of the earth also changes. The forward count is more than 27 degrees, and the moon runs 13 degrees 15 minutes every day, so it takes 12: 44: 2.8 to return to the moon on the 29th, which is called "the first moon", and it is called the moon according to customs, which means the first moon.