There is no Jia in the mountains, and I don't know the meaning of the year.

This means that because there is no calendar in the mountains, the slight cold and the great cold in the 24 solar terms have passed, and I don't know that the Spring Festival is coming.

Said by: The Journey to the West, a classic literary masterpiece, once said, "The mountains have no children, and the cold does not know the year." . The "Jiazi" mentioned here refers to the calendar that marks the year with trunk branches. This means that because there is no calendar in the mountains, the slight cold and the great cold in the 24 solar terms have passed, and I don't know that the Spring Festival is coming. ?

Calendar is a method to calculate the year, month and day and make them correspond to related astronomical phenomena. This is also a way to coordinate calendar year, calendar month, calendar day and tropic year, new moon and solar day.

It is mainly divided into solar calendar, lunar calendar and yin-yang calendar. The solar calendar is also called the solar calendar, and its calendar year is the tropic of Capricorn. At present, the Gregorian calendar (Gregorian calendar), which is commonly used in the world, is a kind of Gregorian calendar, also called Gregorian calendar for short. The lunar calendar is also called the lunar calendar, or lunar calendar. Its calendar month is lunar month, 12 lunar month, with 30 days for big month and 29 days for small month. The Islamic calendar is one of the lunar calendars. The average calendar year of the Yin-Yang calendar is the tropic year, and the calendar month is the first month of the lunar calendar. Because 12 the first month of the lunar calendar is too different from the tropic year, and the leap month is set in the yin-yang calendar, this calendar is consistent with the moon phase and the periodic movement of the earth around the sun. Other time elements (units) included in the calendar are solar terms, centuries and years.