Monthly refers to the month referred to by the occurrence date after the agreed term.
Since "year" is a time unit, it is naturally related to the calendar, and the formation of the calendar is the product of the movement of celestial bodies and the growth law of all things. This process develops with the progress of society and the improvement of people's knowledge.
Another meaning of "year" is harvest. There are four seasons in a year, which is gradually recognized according to the cyclic law of crop growth, growth, harvest and storage. Therefore, in ancient records, the interpretation of "year" is "ancient book leaves" Harvest grain is called "one year", and harvest is called "big year", also called "bumper year". The emperor prayed and called this place full of grain "Hall of Praying for the New Year". When singing the praises of the emperor in traditional Chinese opera, there are lyrics of "the monarch is happy while the minister is happy, and the grain is abundant". The word "nian" was originally the original word of the word "barnyard grass", which means that the crops are mature and well-fed. The word "nian" in Oracle Bone Inscriptions is the image of a bumper harvest of fruits, so it is not difficult to understand the close relationship between "nian" and crops.
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