Plants depend on sunlight to grow. It should be said that China should have invented the solar calendar to guide farming in ancient times.

1, the Gregorian calendar refers to the law formulated according to the period of revolution of the Earth around the sun, which is universal all over the world, and is also called the Gregorian calendar.

2. The lunar calendar is based on the cycle of the moon's revolution around the earth. There is a big deviation between the lunar calendar and the solar calendar, so it is often necessary to set up a touch-up month, that is, to add the date of the whole month to the calendar, which is inconvenient to use and rarely used.

3. The lunar calendar refers to the solar calendar, which is based on the solar calendar (note rather than the lunar calendar) and consists of the unique agricultural solar terms in the Central Plains of China. There is a saying in the Song Dynasty that "the first half of the year is June 21st, and the second half is August 23rd". That is to say, solar terms such as the vernal equinox and rain in the first half of the year mostly fall on the 6th and 2 1 day of each month in the solar calendar, while solar terms such as the Millennium and beginning of winter in the second half of the year mostly fall on the 8th and 23rd of each month in the solar calendar. You see, the interval from 6th to 2nd1and from 8th to 23rd is exactly fifteen days, that is, half a solar calendar month. Each solar month has an average of 30 days, including two solar terms, so a year is exactly 24 solar terms. So generally speaking, the lunar calendar is the solar calendar plus the solar terms that guide the farming season.

4. The lunar calendar corresponds to the moon phase. On the first day of the lunar calendar, you can't see the moon at night, because the moon actually crosses the sky during the day. Similarly, the fifteenth day of the lunar calendar must be a full moon, which means that the moon runs on the extension line connecting the sun and the earth. There is also a saying here that "the moon in the sky is round and the moon on the ground is half". Last month refers to the moon, and next month refers to every month in the lunar calendar.

5, so some people think that the lunar calendar is related to the lunar calendar, which is a misunderstanding. Many people will say that the Mid-Autumn Festival is the 15th day of the eighth lunar month, and even the Spring Festival party will say that tomorrow is the Lunar New Year, which is wrong. If you don't believe me, the Spring Festival in 20 12 is of course the first day of the lunar calendar, but it is 20 12. 1.23 according to the solar calendar, which is inconsistent with the solar calendar. And 20 12. 1.20 just passed the great cold of the lunar calendar, corresponding to the solar calendar.