What's the difference between the lunar calendar and the solar calendar?

Lunar calendar: The lunar calendar does not consider the earth's revolution around the sun, so the changes of the four seasons in the lunar calendar have no fixed time and cannot reflect the seasons, which is a great shortcoming. In order to overcome this shortcoming, people later decided on a compromise calendar, which is the so-called lunar calendar. The summer calendar (also called lunar calendar) that China is still using now is this kind of lunar calendar.

Like the lunar calendar, it also customizes a month according to the time when the moon is full and short, which is 30 days for the big month and 29 days for the small month. However, it adds leap months to make the average number of days in a year close to the solar calendar, so as to adjust the four seasons. In the summer calendar, there is an extra leap month every two or three years.

Gregorian calendar: Gregorian calendar is also an international Gregorian calendar. The Gregorian calendar is customized for one year, ***365 days, 5 hours, 48 minutes and 46 seconds. The average year is only an integer of 365 days, not a mantissa;

A year is divided into 12 months, big month 3 1 day, small month 30 days, and February only has 28 days. The mantissa of four years accumulated to about *** 1 day, and it was added to February of the fourth year. This year is called leap year, so February in leap year has 29 days.

2. Calculation method

Lunar calendar: In astronomy, the lunar calendar mainly refers to the calendar arranged according to the moon phase cycle, in which the moon orbits the earth once (based on the sun, the actual moon orbits more than once). ) is January, that is, the calendar based on the moon, with twelve calendar months in a year.

Gregorian calendar: Gregorian calendar is also called Gregorian calendar. The month and date of the Gregorian calendar are very consistent with the position of the sun on the ecliptic. According to the date of the Gregorian 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.

3, the operation law is different

Lunar 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 an angle of five degrees and nine minutes. When the moon goes around the earth once, it appears twice on the ecliptic, which lasts for 7 hours and 43 minutes 1 1.5 seconds on the 27th, so it is called "sidereal 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.

Gregorian calendar: A calendar based on the period of the earth's movement around the sun.

Baidu encyclopedia-lunar calendar

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