The so-called "calendar", refers to the relationship between the years, months, reckoning day length and the time sequence, formulate rules. Calendar with other sciences, originates from the work practice of production and life practice. No matter what kind of calendar, its main content, are coordinated calendar cycle astronomical period and related problems. The principle is, should strive to equal to the lunar calendar, calendar year should be equal to the tropical year. But because the synodic month and regression are not the day number, so there is big and my calendar distinction, distinction over the years have leap year and leap year. By appropriately matching ohtsuki and Xiaoyue, common and leap years and arrangement, the average calendar is lunar calendar year, the average is equal to the tropical year.
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Illustration: the so-called "calendar", people used to distinguish climate record time, holiday, provided a criterion and the method of calculating the standard. Swire period, "Richuerzuo, Japanese people interest", with the sun as the computing time, discriminant holiday climate standard. Later, with the human evolution, the progressive development of production, there is a need for a measure of time criterion, this criterion must be to natural phenomena as the basis and some people agreed, and thus a "calendar". The so-called "calendar", refers to the relationship between the years, months, reckoning day length and the time sequence, formulate rules. Calendar with other sciences, originates from the work practice of production and life practice. The sun, the earth, the moon itself and the movement between each other, forming the concept of day, month, year. According to the people of the earth's rotation produces the alternation of day and night phenomenon, the formation of the "day" concept; according to the moon revolves around the earth produced the phenomenon, the formation of the "month" concept; and according to the four seasons of revolution of the earth around the sun formed the phenomenon, the concept of "year". On the basis of these three concepts of material movement is independent of each other. According to the accurate determination of the earth's orbit around the sun, a week is about 365.2422 mean solar day, this is called a tropical year. From one new moon to new moon occurs next time interval is 29.53059 mean solar day, this is called a synodic month. In order to return the year as unit, arrange many integer months in a year, and how many days arrangement method of integer and method of how to select the starting point for a year in January, called the "calendar".
"Folk calendar (1800-2100 years):" quick three hundred years calendar read fast culture and calendar knowledge being taboo of Yin Yang and the five elements of folk culture and folk etiquette of heavenly stems and Earthly Branches of eight trigrams named the house of count and health knowledge
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