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 calendar year, calendar month and solar terms and their relationship, calendar year is a time unit expressed by heavenly stems and earthly branches combination, 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 and obtained through solar terms and other factors.