Epochs are one of the important features of calendar systems. An epoch is a particular point in time at which a calendar system may use as its initial time reference, allowing for the consecutive numbering of years from a chosen starting year, date, or time. In the Chinese calendar system, examples include the inauguration of Huangdi or the birth of Confucius. Also, many dynasties had their own dating systems, which could include regnal eras based on the inauguration of a dynasty, the enthronement of a particular monarch, or eras arbitrarily designated due to political or other considerations, such as a desire for a change the luck. Era names are useful for determining dates on artifacts such as ceramics, which were often traditionally dated by an era name during the production process.

Solar and agricultural calendars have a long history in China. Purely lunar calendar systems were known in China, however they tended to be of limited utility, and were not widely accepted by farmers who for agricultural purposes needed to focus on predictability of seasons for planting and harvesting purposes and to thereby produce a useful agricultural calendar. For farming purposes and keeping track of the seasons Chinese solar calendars were particularly useful. The publication of multipurpose and agricultural almanacs has been a longstanding tradition in China.


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The horology of the Chinese calendar also includes variations of the modern Chinese calendar, influenced by the Gregorian calendar, which is a calendar system which was initially adopted in parts of Europe in 1582. Variations include methodologies of the People's Republic of China and Taiwan.

An epoch is a point in time chosen as the origin of a particular calendar era, thus serving as a reference point from which subsequent time or dates are measured. The use of epochs in Chinese calendar system allow for a chronological starting point from whence to begin point continuously numbering subsequent dates. Various epochs have been used. Similarly, nomenclature similar to that of the Christian era has occasionally been used:[1]

On 2 January 1912, Sun Yat-sen announced changes to the official calendar and era. 1 January was 14 Shyyu 4609 Hungd year, assuming a year 1 of 2698 BCE, making 2024 CE year 4722. Many overseas Chinese communities like San Francisco's Chinatown adopted the change.[4]

A solar calendar keeps track of the seasons as the earth and the sun move in the solar system relatively to each other. A purely solar calendar may be useful in planning times for agricultural activities such as planting and harvesting. Solar calendars tend to use astronomically observable points of reference such as equinoxes and solstices, events which may be approximately predicted using fundamental methods of observation and basic mathematical analysis.

The topic of the Chinese calendar also includes variations of the modern Chinese calendar, influenced by the Gregorian calendar. Variations include methodologies of the People's Republic of China and Taiwan.

Although modern-day China uses the Gregorian calendar, the traditional Chinese calendar governs holidays, such as the Chinese New Year and Lantern Festival, in both China and overseas Chinese communities. It also provides the traditional Chinese nomenclature of dates within a year which people use to select auspicious days for weddings, funerals, moving or starting a business.[7] The evening state-run news program Xinwen Lianbo in the People's Republic of China continues to announce the months and dates in both the Gregorian and the traditional lunisolar calendar.

The Chinese calendar system has a long history, which has traditionally been associated with specific dynastic periods. Various individual calendar types have been developed with different names. In terms of historical development, some of the calendar variations are associated with dynastic changes along a spectrum beginning with a prehistorical/mythological time to and through well attested historical dynastic periods. Many individuals have been associated with the development of the Chinese calendar, including researchers into underlying astronomy; and, furthermore, the development of instruments of observation are historically important. Influences from India, Islam, and Jesuits also became significant.

Many Chinese astronomers have contributed to the development of the Chinese calendar. Many were of the scholarly or shi class (Chinese: ; pinyin: sh), including writers of history, such as Sima Qian.

The traditional Chinese calendar was developed between 771 and 476 BCE, during the Spring and Autumn period of the Eastern Zhou dynasty. Solar calendars were used before the Zhou dynasty period, along with the basic sexagenary system.

One version of the solar calendar is the five-elements calendar (; ), which derives from the Wu Xing. A 365-day year was divided into five phases of 73 days, with each phase corresponding to a Day 1 Wu Xing element. A phase began with a governing-element day (), followed by six 12-day weeks. Each phase consisted of two three-week months, making each year ten months long. Years began on a jiz () day (and a 72-day wood phase), followed by a bngz day () and a 72-day fire phase; a wz () day and a 72-day earth phase; a gngz () day and a 72-day metal phase, and a rnz day () followed by a water phase.[8] Other days were tracked using the Yellow River Map (He Tu).

Several competing lunisolar calendars were also introduced as Zhou devolved into the Warring States, especially by states fighting Zhou control during the Warring States period (perhaps 475-221 BCE). The state of Lu issued its own Lu calendar(; ). Jin issued the Xia calendar (; )[11] with a year beginning on the day of the new moon nearest the March equinox. Qin issued the Zhuanxu calendar (; ), with a year beginning on the day of the new moon nearest the winter solstice. Song's Yin calendar (; ) began its year on the day of the new moon after the winter solstice.

This calendar introduced the 24 solar terms, dividing the year into 24 equal parts. Solar terms were paired, with the 12 combined periods known as climate terms. The first solar term of the period was known as a pre-climate (), and the second was a mid-climate (). Months were named for the mid-climate to which they were closest, and a month without a mid-climate was an intercalary month.[citation needed]

The Yuan dynasty Shush calendar (; ; 'season granting calendar') used spherical trigonometry to find the length of the tropical year.[12][13][14] The calendar had a 365.2425-day year, identical to the Gregorian calendar.[15]

Although the Chinese calendar lost its place as the country's official calendar at the beginning of the 20th century,[16] its use has continued. The Republic of China Calendar published by the Beiyang government of the Republic of China still listed the dates of the Chinese calendar in addition to the Gregorian calendar. In 1929, the Nationalist government tried to ban the traditional Chinese calendar. The Kumn Calendar published by the government no longer listed the dates of the Chinese calendar. However, Chinese people were used to the traditional calendar and many traditional customs were based on the Chinese calendar. The ban failed and was lifted in 1934.[17] The latest Chinese calendar was "New Edition of Wnninl, revised edition", edited by Beijing Purple Mountain Observatory, People's Republic of China.[18]

From 1645 to 1913 the Shxin or Chongzhen was developed. During the late Ming dynasty, the Chinese Emperor appointed Xu Guangqi in 1629 to be the leader of the ShiXian calendar reform. Assisted by Jesuits, he translated Western astronomical works and introduced new concepts, such as those of Nicolaus Copernicus, Johannes Kepler, Galileo Galilei, and Tycho Brahe; however, the new calendar was not released before the end of the dynasty. In the early Qing dynasty, Johann Adam Schall von Bell submitted the calendar which was edited by the lead of Xu Guangqi to the Shunzhi Emperor.[19] The Qing government issued it as the Shxin (seasonal) calendar. In this calendar, the solar terms are 15 each along the ecliptic and it can be used as a solar calendar. However, the length of the climate term near the perihelion is less than 30 days and there may be two mid-climate terms. The Shxin calendar changed the mid-climate-term rule to "decide the month in sequence, except the intercalary month."[20] The present traditional calendar follows the Shxin calendar, except:

Horology, or chronometry, refers to the measurement of time. In the context of the Chinese calendar, horology involves the definition and mathematical measurement of terms or elements such observable astronomic movements or events such as are associated with days, months, years, hours, and so on. The Chinese calendar is lunisolar, similar to the Hindu, Hebrew and ancient Babylonian calendars.

Basic horologic definitions include that days begin and end at midnight, and months begin on the day of the new moon. Years start on the second (or third) new moon after the winter solstice. Solar terms govern the beginning, middle, and end of each month. A sexagenary cycle, comprising the heavenly stems (Chinese: ; pinyin: gn) and the earthly branches (Chinese: ; pinyin: zh), is used as identification alongside each year and month, including intercalary months or leap months. Months are also annotated as either long (Chinese: ; lit. 'big' for months with 30 days) or short (Chinese: ; lit. 'small' for months with 29 days). There are also other elements of the traditional Chinese calendar.

Because astronomical observation determines month length, dates on the calendar correspond to moon phases. The first day of each month is the new moon. On the seventh or eighth day of each month, the first-quarter moon is visible in the afternoon and early evening. On the 15th or 16th day of each month, the full moon is visible all night. On the 22nd or 23rd day of each month, the last-quarter moon is visible late at night and in the morning. 006ab0faaa

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