The calendar is the law of the ancient Chinese ancestors who calculated the length of the year, month and day and the relationship between them, and formulated the chronological order.

According to the rotation of the earth, the people of China formed the concept of "day" according to the phenomenon of day and night alternation of the earth; The concept of "month" is formed according to the rotation of the moon around the earth, which produces synodics, and the concept of "year" is formed according to the phenomenon of the alternation of seasons caused by the rotation of the earth around the sun.

Accompanying the legislation is the almanac, which is the year of arrangement,

"This Novel is Healthy" Chapter 186 Chapter 1 Zhao Gao is hitting in his hand, please wait a moment,

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