What do you think of children's birthday party?

Understand the concepts of calendar year, calendar month and solar terms. To understand the concepts of Gregorian calendar year, Gregorian calendar month and solar terms, and their relationships, Gregorian calendar year is a time unit expressed by heavenly stems and earthly branches combination, Gregorian calendar month is a time unit expressed by Gregorian calendar month and heavenly stems and earthly branches combination, and solar terms are determined by the time when the sun reaches the meridian. On the same day, it refers to a certain day every year, which is determined by the China lunar calendar, solar terms and other factors.