GB/T 33661-2017 in English
VALIDCalculation and promulgation of the Chinese calendar
- Issued on:2017-05-12
- Implemented on:2017-09-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$194.00
| Standard No: | GB/T 33661-2017 |
| Document status: | VALID |
| Title in English: | Calculation and promulgation of the Chinese calendar |
| Title in Chinese: | 农历的编算和颁行 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 1~3 business days |
| Issued on: | 2017-05-12 |
| Implemented on: | 2017-09-01 |
| ICS Classification: | 07.040-Astronomy. Geodesy. Geography |
| Chinese Classification: | A46-Astronomy |
| Professional Classification: | GB-National Standard |
| Related Keywords: | lunar calendar compilation
lunar calendar moon calculation traditional chinese calendar calculation method |
| Related Topics: | GB/T33661-2017
lunar calendar GB/T 33661-2017 Year of Jiazi GBT33661 GB/T 33661-2017 gbt33661-2017 gb/t 33661 |
《GB/T 33661-2017农历的编算和颁行》由491（中国科学院）归口，主管部门为中国科学院。
Introduction
In-depth interpretation of GB/T 33661—2017 Lunar Calendar Compilation and Issuance Standard
| Dimensions | Scope of application | Main provisions | Implementation requirements |
|---|---|---|---|
| Compilation rules | The relationship between the calculation of the lunar month and the solar terms | The new moon day is the first lunar day of the lunar month, and the leap year rule is based on the solar terms after the winter solstice | It is necessary to follow the International Earth Rotation and Reference System Service specifications for accurate calculations |
| Calculation model | Prediction accuracy of the positions of the sun and the moon | Calculation of the synodic month and tropical year based on IERS specifications | Ensure that the calculation results reach second-level accuracy |
| Representation method | Naming and combination of lunar years, months and days | Including the Ganzhi calendar, the zodiac calendar, the numerical calendar, etc. | Clearly mark the Gregorian calendar year to assist understanding |
Standard formulation background and technical evolution analysis
As the traditional Chinese calendar, the standardization of its compilation and promulgation is directly related to the accuracy of social production and life. In the past, due to the lack of a unified standard, the lunar calendars used in different regions were different, which brought many inconveniences to people's daily lives.
Technological Evolution
With the development of astronomy, the calculation method of the lunar calendar has undergone a transformation from empirical rules to precise models. Modern calculations are based on the International Earth Rotation and Reference System Service (IERS) specifications, ensuring the accuracy of the forecast of the position of the sun and the moon.
Professional Terminology Explanation and Application Cases
Synonic Month
Refers to the time interval from one new moon to the next new moon, which is approximately 29.53058861 days.
Zhongqi
The odd ordinal solar terms in the 24 solar terms, such as the winter solstice and the spring equinox, are used to determine the length of the lunar month.
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