Is the solar calendar the same as the lunar calendar? What is the lunar calendar?

The solar calendar is different from the lunar calendar. At present, there are two kinds of calendars used in China: solar calendar (also called solar calendar) and lunar calendar (also called lunar calendar). The Gregorian calendar defines a year as 365 days, which is 0.2422 days shorter than the tropical year, and it is called a normal year. So the difference of four years is 23 hours 15 minutes and 4 seconds (5 hours, 48 minutes and 46 seconds ×4), which is close to 1. Add 44 minutes and 56 seconds every four years and 3 days, 2 hours, 53 minutes and 20 seconds every 400 years (44 minutes and 56 seconds × 100). So we have to add three days every 400 years. In order to facilitate the calculation, the rule of "leap every four years, not leap in a hundred years, and leap again in four hundred years" was formulated.

At present, there are Gregorian calendar (also called solar calendar) and lunar calendar (also called lunar calendar) in use in China. According to the needs of agricultural production, the lunar calendar is adopted. The lunar calendar is sometimes1February and sometimes1March, but one month in1March is called leap month, such as leap July and leap March. It is not included in the normal month series. Because the moon 12 is 354.3672 days (29.5306× 12), which is different from the tropic year by 1 1 day, there will be 30 days more after three years, so a leap month will be added after three years to eliminate this error, so this year. If seven leap months are inserted into 19, it is almost equal to 19 tropical year, that is, 19 leap months. This discovery predates the ancient Greeks 160 years.

The solar calendar is based on the revolution of the earth around the sun, the lunar calendar is based on the moon, and the yin-yang calendar is based on both.