Why are there deviations between the lunar calendar and the solar calendar?

Because the calculation methods of lunar calendar and solar calendar are different. The lunar calendar takes the change cycle of the moon phase, that is, the length of the moon as a month, and adds the "twenty-four solar terms" component of the dry calendar. Based on the summer calendar (lunar calendar) and the movement cycle of the earth around the sun, a calendar composed of solar calendars. The Gregorian calendar year is approximately equal to the tropic year, one year 12 months. This "month" has nothing to do with the first lunar month. The month and date of the solar calendar are very consistent with the position of the sun on the ecliptic. According to the date of the solar calendar, we can clearly see the changes of cold and warm seasons in a year. But every month, you can't see the new moon, the new moon, the new moon. At present, the Gregorian calendar, which is commonly used in the world, is a solar calendar, with 365 days in a normal year and 366 days in a leap year, once every four years, once in a hundred years and once again in the 400th year, that is, there are 97 leap years every 400 years. The average length of the Gregorian calendar is only 26 seconds away from the tropic year, and it takes only one day to accumulate 3300 years.

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