{"id":15328,"date":"2026-11-11T03:40:24","date_gmt":"2026-11-11T03:40:24","guid":{"rendered":"https:\/\/www.chinaculturepro.com\/?p=15328"},"modified":"2026-11-12T14:19:09","modified_gmt":"2026-11-12T14:19:09","slug":"chinese-calendar-reform-history","status":"publish","type":"post","link":"https:\/\/www.chinaculturepro.com\/ru\/chinese-calendar-reform-history\/","title":{"rendered":"Chinese Calendar Reform History: Institutions, People and Historical Change"},"content":{"rendered":"\n<section class=\"tcjdi-quick-answer\"><h2>Quick Answer: What Changed in Chinese Calendar Reforms?<\/h2>\n<p class=\"p1\">Chinese calendar reforms changed how officials calculated and assigned dates. Court astronomers used observations and mathematical rules to keep lunar months aligned with the solar year. The court used the results to issue official dates. Reform could change a rule for assigning months, a model of the heavens or the astronomical tables used to calculate dates.<sup>[1][2][4][5]<\/sup> <\/p>\n<ul>\n<li><strong>Observe:<\/strong> Record evidence such as solar shadows or eclipses.<\/li>\n<li><strong>Calculate:<\/strong> Use a model to predict when astronomical events will occur.<\/li>\n<li><strong>Issue:<\/strong> Publish dates and month assignments for official use.<\/li>\n<\/ul>\n<p class=\"p1\">Different reforms revised different parts of this process.<\/p><\/section>\n<figure class=\"tcjdi-infographic\" style=\"width:500px;max-width:100%;margin:24px auto;text-align:center\"><img fetchpriority=\"high\" decoding=\"async\" src=\"https:\/\/www.chinaculturepro.com\/wp-content\/uploads\/2026\/11\/Chinese-calendar-reforms-lunar-solar-cycles-Taichu-Shoushi-and-Shixian.webp\" alt=\"Chinese calendar reforms lunar solar cycles Taichu Shoushi and Shixian\" title=\"Chinese calendar reforms lunar solar cycles Taichu Shoushi and Shixian\" width=\"1440\" height=\"2560\" style=\"width:500px;max-width:100%;height:auto;margin:0 auto\" \/><figcaption>Chinese calendar reforms lunar solar cycles Taichu Shoushi and Shixian<\/figcaption><\/figure>\n<p class=\"p1\">A calendar has to tell people what date it is. Its makers also need ways to predict where the Sun and Moon will be. Chinese reforms changed those calculations while leaving the court responsible for issuing dates.<\/p>\n<h2>What a Lunisolar Calendar Has to Calculate<\/h2>\n<p class=\"p1\">A lunisolar calendar (\u9634\u9633\u5386, y\u012bny\u00e1ngl\u00ec) coordinates two cycles. A lunar month follows the Moon\u2019s phases, while the solar year tracks the seasons. Twelve lunar months run about eleven days short of a solar year. An additional month, inserted when the calendar\u2019s rules require it, prevents the numbered months from continually shifting through the seasons.<sup>[1][2]<\/sup> <\/p>\n<p class=\"p1\">The <a href=\"https:\/\/www.chinaculturepro.com\/24-solar-terms\/\">twenty-four solar terms<\/a> mark positions in the Sun\u2019s annual cycle. A calendar can use these markers to decide how to number months or assign an extra one. Observations help test the predictions, but officials must still choose the rules that turn an astronomical event into a date.<sup>[1][2][7]<\/sup> <\/p>\n<h2>Taichu: Reform Under Emperor Wu of Han<\/h2>\n<p class=\"p1\">Emperor Wu of the <a href=\"https:\/\/www.chinaculturepro.com\/han-dynasty\/\">Han dynasty<\/a> adopted the Taichu calendar (\u592a\u521d\u5386, T\u00e0ich\u016b l\u00ec) in the reform of 104 BCE. The reform is associated with beginning the year with the first numbered month and fixing the winter solstice in the eleventh month. It also gave the court an occasion to declare a new arrangement of official time.<sup>[2][3][7]<\/sup> <\/p>\n<p class=\"p1\">The surviving accounts in the <em>Records of the Grand Historian<\/em> and the <em>History of the Han<\/em> emphasize different details. Christopher Cullen\u2019s comparison suggests that an initial scheme and a subsequent revision used different mathematical constants. The two accounts help distinguish what officials proposed from the system subsequently associated with the name Taichu.<sup>[3]<\/sup> <\/p>\n<h2>Shoushi: Measuring the Sun for a Yuan Calendar<\/h2>\n<p class=\"p1\">The <a href=\"https:\/\/www.chinaculturepro.com\/yuan-dynasty\/\">Yuan dynasty<\/a> commissioned an effort that produced the Shoushi calendar (\u6388\u65f6\u5386, Sh\u00f2ush\u00ed l\u00ec), completed in 1280 and put into use from 1281. Wang Xun directed the calculations and Guo Shoujing supervised observations. They worked in the same project, but recording a shadow and constructing tables from the observations called for different work.<sup>[4]<\/sup> <\/p>\n<p class=\"p1\">One series of observations tracked the changing length of the Sun\u2019s midday shadow around winter. A gnomon and a marked scale let astronomers measure the shadow on different dates. A series of readings around winter helped estimate the solstice. Astronomers then used the measurements to calculate future dates.<sup>[4]<\/sup> <\/p>\n<h2>Shixian: A Late Ming Project Adopted by the Qing<\/h2>\n<p class=\"p1\">In 1629 the late Ming court commissioned a calendar revision led by <a href=\"https:\/\/www.chinaculturepro.com\/xu-guangqi\/\">Xu Guangqi<\/a>. Li Tianjing succeeded him, and Jesuit astronomers contributed to the project. The compendium incorporated methods for predicting eclipses and working with astronomical instruments. The Library of Congress\u2019s digitized copy of the later compilation illustrates the range of material, from eclipse tables to treatises on instruments.<sup>[5][6]<\/sup> <\/p>\n<p class=\"p1\">The Qing adopted revised methods for the Shixian calendar (\u65f6\u5baa\u5386, Sh\u00edxi\u00e0n l\u00ec) in 1645. One change was to determine solar terms using the calculated position of the Sun, which makes the time between successive terms unequal. Lunar months and solar terms still worked together. The <a href=\"https:\/\/www.chinaculturepro.com\/chinese-calendar-vs-gregorian-calendar\/\">comparison with the Gregorian calendar<\/a> explains the difference between their organizing rules.<sup>[5][7]<\/sup> <\/p>\n<h2>FAQs About Chinese Calendar Reform<\/h2>\n<h3>Why did the Chinese calendar need leap months?<\/h3>\n<p class=\"p1\">Twelve lunar months fall short of a solar year. Inserting an extra month when needed keeps the numbered months within roughly the same part of the seasonal cycle.<\/p>\n<h3>Did the Shixian reform adopt the Gregorian calendar?<\/h3>\n<p class=\"p1\">The Qing reform introduced revised astronomical methods within a calendar that retained lunar months and solar terms. The Gregorian calendar organizes its months separately from Moon phases.<\/p>\n<h3>Can a modern conversion table date an early imperial record?<\/h3>\n<p class=\"p1\">Check the reign, region and calendar in force. Modern rules projected backward can differ from the dates officials originally calculated and recorded.<\/p>\n<h2>Sources<\/h2>\n<p class=\"p1\">[1] Hong Kong Observatory. <a href=\"https:\/\/www.hko.gov.hk\/en\/gts\/time\/calendarinfo.htm\" target=\"_blank\" rel=\"noopener noreferrer\">Calendar<\/a><\/p>\n<p class=\"p1\">[2] Christopher Cullen, Oxford University Press. <a href=\"https:\/\/academic.oup.com\/book\/26733\/chapter-abstract\/195576498\" target=\"_blank\" rel=\"noopener noreferrer\">Heavenly Numbers: The Astronomical Empire<\/a><\/p>\n<p class=\"p1\">[3] Christopher Cullen, Journal for the History of Astronomy. <a href=\"https:\/\/journals.sagepub.com\/doi\/10.1177\/002182869302400303\" target=\"_blank\" rel=\"noopener noreferrer\">Motivations for Scientific Change in Ancient China<\/a><\/p>\n<p class=\"p1\">[4] Biographical Encyclopedia of Astronomers, University of St Andrews. <a href=\"https:\/\/mathshistory.st-andrews.ac.uk\/BEA\/guo_shoujing_bea.pdf\" target=\"_blank\" rel=\"noopener noreferrer\">Guo Shoujing<\/a><\/p>\n<p class=\"p1\">[5] Catherine Jami, Science in Context. <a href=\"https:\/\/www.cambridge.org\/core\/services\/aop-cambridge-core\/content\/view\/S0269889700003513\" target=\"_blank\" rel=\"noopener noreferrer\">European Science in China or Western Learning?<\/a><\/p>\n<p class=\"p1\">[6] Library of Congress. <a href=\"https:\/\/www.loc.gov\/resource\/gdcwdl.wdl_11412\/?sp=11\" target=\"_blank\" rel=\"noopener noreferrer\">Xi yang xin fa li shu, digitized treatises on calendrical astronomy<\/a><\/p>\n<p class=\"p1\">[7] Helmer Aslaksen, Berkeley Math Circle. <a href=\"https:\/\/mathcircle.berkeley.edu\/sites\/default\/files\/BMC6\/ps0405\/calendar-talk-pictures.pdf\" target=\"_blank\" rel=\"noopener noreferrer\">The Mathematics of the Chinese Calendar<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Learn what changed in China\u2019s Taichu, Shoushi and Shixian calendar reforms, from observations of the Sun and Moon to the dates issued by imperial courts.<\/p>","protected":false},"author":1,"featured_media":15329,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[356],"tags":[295,359,358],"class_list":["post-15328","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-history-civilization","tag-cultural-history","tag-historical-society","tag-hub-chinese-history"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO Pro 5.0.3 - aioseo.com -->\n\t<meta name=\"description\" content=\"Learn what changed in China\u2019s Taichu, Shoushi and Shixian calendar reforms, from observations of the Sun and Moon to the dates issued by imperial courts.\" \/>\n\t<meta name=\"robots\" content=\"noindex, max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"Anthony\"\/>\n\t<meta name=\"yandex-verification\" content=\"a48113a626715129\" \/>\n\t<link rel=\"canonical\" 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