Why isn't the Spring Festival the same day as beginning of spring?

Beginning of spring belongs to the solar calendar and the Spring Festival belongs to the lunar calendar, which is the basic difference between them. Spring Festival and beginning of spring belong to two calendars, which is the fundamental reason why Spring Festival and beginning of spring do not necessarily coincide.

The first day of the first month is the Spring Festival. Setting the Spring Festival and New Year's Day is the contribution of the lunar calendar. The moon is short and round, which is determined by three points and one line of the sun, the moon and the earth twice: the sun, the moon and the earth are so three points and one line, the first day. Sun-Earth-Moon, three point one line, fifteen.

The moon is between the sun and the earth. What people see is the backlight of the moon, which is why it is so bright. The full moon is full of moonlight The earth is between the sun and the moon, and people see the light-receiving surface, which is why we can expect it. It is the contribution of the lunar calendar to make the beginning of the year the Spring Festival. From the first day of the first month, there will be a full moon in January, and twelve months will be a year.

Extended data:

Time evolution of Spring Festival:

In ancient times, the spatial changes of astronomical phenomena were used to mark the time changes of the four seasons of the year. When the bucket handle of Beidou points to Yin (due east and due north), it is the node of beginning of spring. In the era of ancient cadres and branches, Yin was built in the first month (photo by Teague). In the historical development and evolution, due to the changes of dynasties and calendars, the date of the beginning of a year (New Year) is also different. China's New Year, the date is not consistent:

In ancient times, the epoch method was taken from the age of eighteen, that is, the chronology method of cadres and branches, with silver moon as the first month and beginning of spring as the beginning of the year. After heavenly stems and earthly branches's simplification, ten days are: A, B, C, D, E, Ji, Ke, Xin, Ren and Gui, and twelve are: Yin, Mao, Chen, Si, Wu, Wei, Shen, You, Xu, Hai, Zi and Ugly. Ten heavenly stems and twelve earthly branches are matched in turn to form a 60-week calendar.

People's Network-What is the relationship between Spring Festival and beginning of spring?