Ancient Star Charts & Astronomical Records: China's Celestial Heritage
古星图与天文古籍 — 中华天文遗产
For over four thousand years, Chinese astronomers meticulously mapped the heavens, recorded rare celestial phenomena,
and preserved their observations in star charts carved on stone, painted on silk, and inscribed in imperial histories.
These ancient documents are among the most valuable astronomical records in human history —
bridging the ancient and modern understanding of our universe.
China possesses one of the longest, most continuous astronomical traditions in the entire world.
While many ancient civilizations made significant contributions to stargazing — the Babylonians, Egyptians,
Greeks, and Maya among them — China's record stands apart for its extraordinary continuity, its depth of
documentation, and the sheer volume of observational data preserved across millennia. From the earliest
oracle bone inscriptions of the Shang Dynasty (c. 1600–1046 BCE) to the precise imperial astronomical
bureaus of the Ming and Qing Dynasties, Chinese sky-watchers maintained an unbroken chain of celestial
observation spanning more than four thousand years.
This tradition was not merely academic or recreational. In ancient China, astronomy was a matter of
statecraft. The emperor's legitimacy was understood to derive from the Mandate of Heaven (天命, Tiān Mìng),
and the accurate reading of celestial signs was considered essential to good governance. An unexpected
comet, an unexplained guest star, or a miscalculated eclipse could be interpreted as omens of heaven's
displeasure — or its favor. As a result, the Chinese imperial court maintained one of the most
sophisticated astronomical bureaucracies in the ancient world, with dedicated officials tasked with
continuous sky observation, calendar computation, and the recording of all notable celestial events.
The fruits of this tradition are staggering in their scope. Ancient Chinese astronomers produced
detailed star charts mapping thousands of stars, compiled star catalogues organizing the heavens into
hundreds of named star groups, recorded rare celestial phenomena including supernovae, comets, sunspots,
and auroras, and invented precision instruments for measuring the positions and movements of celestial
bodies. Many of these records are unique — no other civilization documented certain events that only
Chinese astronomers witnessed and preserved. Today, these ancient records are invaluable to modern
astronomers studying the history of supernovae, the long-term behavior of comets, solar activity cycles,
and the changing luminosity of stars over centuries.
In this article, we explore the most famous star charts of ancient China, examine the historical
astronomical records preserved in dynastic histories, revisit some of the rarest celestial phenomena
ever documented, survey the instruments Chinese astronomers used, and consider the lasting legacy of
this remarkable heritage. For a broader overview of the Chinese celestial system, see our
Overview of Ancient Chinese Star Culture.
天垂象，见吉凶，圣人象之。
"Heaven displays its signs, revealing fortune and misfortune; the sage models himself upon them."
— I Ching (易经), Book of Changes, c. 800 BCE
2. Famous Star Charts
传世星图
China's surviving star charts are among the most treasured astronomical documents in the world.
They range from paintings on silk discovered in sealed cave libraries to monumental stone carvings
that have endured for centuries in the open air. Each chart reflects not only the astronomical
knowledge of its era but also the artistic conventions, cosmological beliefs, and technical capabilities
of the civilization that produced it. Below we examine the most significant of these charts.
Tang Dynasty · c. 700 CE · 唐代
Dunhuang Star Chart (敦煌星图)
The Dunhuang Star Chart is one of the oldest and most complete star maps in the entire world.
Discovered in the early 20th century among the sealed library of the Mogao Caves (莫高窟, also known
as the Caves of the Thousand Buddhas) at Dunhuang in China's northwestern Gansu Province, this
remarkable document dates to approximately 700 CE during the Tang Dynasty. The chart was part of a
vast trove of manuscripts, paintings, and textiles that had been sealed in a cave chamber (藏经洞,
Cave 17) around 1000 CE and remained hidden for nearly a thousand years before its rediscovery.
The Dunhuang Star Chart depicts more than 1,350 stars organized into 257 Chinese star groups
(星官, xīng guān). It is remarkable for both its astronomical accuracy and its artistic beauty.
The chart presents the sky in a series of panels — one panel showing the regions near the North
Celestial Pole (the circumpolar stars visible year-round from northern China), and twelve additional
panels showing bands of the sky corresponding to the twelve months of the year. This arrangement
effectively shows which stars are visible in each season, making the chart both a reference map
and a practical observing guide.
What makes the Dunhuang Star Chart especially significant to modern astronomers is its role as a
bridge between ancient and contemporary star catalogs. Because the chart records the positions of
stars with reasonable precision, scientists have been able to use it to study how certain stars may
have changed in brightness or position over the past thirteen hundred years. The chart is currently
held in the British Library in London, where it is recognized as one of the most important
astronomical documents in existence and has been included in UNESCO's Memory of the World Programme.
Song Dynasty · 1247 CE · 南宋
Suzhou Stone Carving Astronomical Map (苏州石刻天文图)
The Suzhou Stone Carving Astronomical Map is one of the oldest surviving stone-carved star charts
in the world. It was engraved on a stone stele in 1247 CE during the Southern Song Dynasty,
under the direction of the scholar Wang Zhiyuan (王致远). The stele stands in the Suzhou Confucian
Temple (苏州文庙) in Jiangsu Province and has survived for nearly eight hundred years.
The map records over 1,440 stars organized into the traditional Chinese system of Three Enclosures
(三垣), Twenty-Eight Mansions (二十八宿), and numerous additional star groups. The Milky Way is
clearly depicted as a luminous band crossing the sky, and the positions of the major star groups
are shown with remarkable accuracy for the era. The chart also includes explanatory text describing
the total number of stars catalogued, the names and boundaries of the star groups, and the principles
of celestial coordinate measurement.
The Suzhou Astronomical Map is notable for several reasons. First, it is carved in stone — a medium
chosen for permanence, reflecting the Chinese belief that astronomical knowledge was a civilizational
treasure worthy of the most durable preservation. Second, it is one of the few ancient star maps
that can be physically visited and studied in situ today, making it an invaluable resource for both
scholars and the general public. Third, its accuracy has been praised by modern astronomers who have
confirmed that the star positions it records are consistent with the precession of the equinoxes
over the past seven centuries. The Suzhou Stone Carving has been considered for inclusion in
UNESCO's Memory of the World Register and remains one of China's most celebrated astronomical artifacts.
Warring States · 4th Century BCE · 战国
Gan Shi Xing Jing (甘石星经) — World's Earliest Star Catalogue
Long before star charts were painted on silk or carved in stone, Chinese astronomers compiled
systematic catalogues of the stars. The most important of these early works is the
Gan Shi Xing Jing (甘石星经), attributed to two astronomers of the Warring States period:
Gan De (甘德) and Shi Shen (石申). Working in the fourth century BCE — roughly 2,400 years ago —
these scholars produced what is widely recognized as the earliest known star catalogue in the world.
The Gan Shi Xing Jing catalogued more than 800 stars organized into 121 star groups.
Shi Shen's contribution, sometimes called the Shi Shen Star Catalogue (石氏星经),
recorded the positions of stars using a system of "distance measurements" (度数) that represented
an early form of celestial coordinate determination. Gan De's work added observations of planetary
motions and, remarkably, included what may be the earliest recorded observation of one of Jupiter's
moons — centuries before the invention of the telescope.
The significance of this catalogue cannot be overstated. It predates the famous star catalogue
of Hipparchus of ancient Greece — long considered the foundation of Western positional astronomy —
by approximately two hundred years. While the original texts of the Gan Shi Xing Jing
have not survived in their complete form, substantial portions were preserved through quotations
in later works, particularly the Kaiyuan Zhanjing (开元占经) compiled during the Tang Dynasty.
These fragments confirm that Gan De and Shi Shen achieved a level of systematic stellar observation
that was unmatched anywhere in the world at that time. For more on how this system organized the sky,
see our article on the Twenty-Eight Mansions.
The creation of star charts was guided by competing cosmological theories about the structure of
the universe. Ancient Chinese thinkers developed three major models, each with different implications
for how the sky should be mapped and understood:
Gaitian (盖天说, "Canopy Heaven") — The earliest model, proposing that the sky
is a dome or umbrella covering a flat or domed earth. Stars were believed to be attached to this
celestial canopy. This model was dominant during the Zhou Dynasty and influenced early star chart design.
Huntian (浑天说, "Celestial Sphere") — The most influential model, proposing that
the heavens form a complete sphere surrounding the earth, which floats at the center. This theory,
championed by the great polymath Zhang Heng (张衡, 78–139 CE), resembled the later Western Ptolemaic
model and provided the theoretical foundation for the armillary sphere (浑天仪) and most subsequent
star charts.
Xuanye (宣夜说, "Infinite Empty Sky") — The most radical model, proposing that
the sky is infinite and empty, with celestial bodies floating freely in space rather than being
attached to any sphere or dome. Stars were understood to be self-luminous bodies suspended in
boundless emptiness. Though less influential historically, this model is strikingly modern in its
conception and has been compared to aspects of contemporary cosmology.
These three theories coexisted and competed for centuries, each contributing to the richness of
Chinese astronomical thought. The star charts that survive from different periods reflect the
prevailing cosmological model of their era, offering a fascinating window into how ancient Chinese
thinkers visualized the structure of the cosmos.
3. Historical Astronomical Records
正史天文记载
Perhaps the most remarkable aspect of China's astronomical heritage is the institutionalized system
of celestial record-keeping that persisted across successive dynasties for over two thousand years.
Unlike many civilizations where astronomical observations were left to individual scholars, priests,
or temple astronomers, the Chinese imperial court maintained official astronomical bureaus — the most
famous being the Imperial Astronomical Bureau (司天监, Sī Tiān Jiān) and its various predecessors —
whose explicit mandate was to observe the sky continuously and record everything of note.
The Twenty-Four Histories (二十四史)
The primary repository for these records is the Twenty-Four Histories (二十四史), the canonical
collection of Chinese dynastic histories spanning from the legendary Xia Dynasty through the Ming Dynasty.
Each history typically includes a dedicated astronomical chapter titled Tianwenzhi (天文志,
"Treatise on Astronomy") or Tianwen Zhi (天文志, "Record of Celestial Patterns"). These chapters
systematically document solar eclipses, lunar eclipses, cometary appearances, meteor showers, novae,
sunspots, aurora sightings, and other celestial phenomena observed during each dynasty's reign.
The result is a continuous, unbroken record of astronomical observations spanning more than two thousand
years — a dataset of incomparable value to modern science. No other civilization has produced anything
quite like it. The Greek astronomical tradition, while brilliant in its theoretical achievements, did
not maintain the same kind of systematic, continuous observational record-keeping. The Babylonian
records, though extensive, were scattered and partially lost. Only China's records offer a seamless,
dynasty-by-dynasty account of what was seen in the sky over two millennia.
Solar Eclipse Records (日食记录)
Among the most valuable entries in the dynastic astronomical treatises are the solar eclipse records.
China's solar eclipse observations are the most complete in the ancient world, with records dating
back to the Shang Dynasty. The Shangshu (尚书, "Book of Documents") contains what may be one of
the earliest recorded solar eclipses, traditionally dated to approximately 2137 BCE — though the
precise dating is debated. By the time of the Spring and Autumn Period (770–476 BCE), solar eclipse
records had become remarkably precise. The Chunqiu (春秋, "Spring and Autumn Annals"),
the chronicle of the state of Lu, records 37 solar eclipses between 722 and 481 BCE, of which 33
have been confirmed by modern astronomical calculation — an extraordinary accuracy rate for observations
made without telescopes.
Comet, Meteor, and Nova Records
Beyond eclipses, the dynastic histories contain extensive records of comets, meteor showers, novae,
and other transient celestial phenomena. Chinese astronomers distinguished carefully between different
types of comets based on their appearance, tail direction, and duration, and they recorded the dates
and positions of their appearances with a precision that allows modern astronomers to reconstruct
the orbits of many historical comets. Meteor shower records dating to the Warring States period and
later provide data for studying the long-term evolution of meteor streams. And the records of
"guest stars" (客星, kè xīng) — stars that appeared suddenly where none had been visible before —
are of unique importance, as we shall see in the next section.
4. Rare Celestial Phenomena Records
罕见天象记录
Some of the most extraordinary contributions of Chinese astronomical record-keeping are the observations
of rare celestial phenomena that no other civilization documented — or at least not with comparable
detail and precision. These records have proven invaluable to modern astronomers seeking to understand
the history of supernovae, the long-period behavior of comets, the cycles of solar activity, and even
the changing magnetic field of the Earth.
SN 1054 — The Crab Nebula Supernova (客星)
In July of 1054 CE, during the reign of Emperor Renzong of the Song Dynasty, Chinese astronomers
observed a spectacular event: a brilliant new star appeared in the sky, in the area of the sky
associated with the Chinese lunar mansion of Tianguan (天关), near what we now call the constellation
Taurus. This was a supernova — the catastrophic explosion of a massive star at the end of its life —
and it was one of the most dramatic celestial events in recorded history.
The Chinese records describe the "guest star" (客星) as being so bright that it was visible in
daylight for twenty-three days. It remained visible to the naked eye at night for nearly two years
before fading from sight. The primary accounts appear in the Song Shi (宋史, "History of Song")
and the Xu Zizhi Tongjian Changbian (续资治通鉴长编), providing precise dates and descriptions
of the star's brightness and location.
For centuries, the connection between this historical "guest star" and a known celestial object
remained unknown. Then, in the 20th century, astronomers studying the Crab Nebula (M1) — a
spectacular supernova remnant in Taurus — determined through the expansion rate of its gas clouds
that the explosion that created it must have occurred approximately 900 years ago. The Chinese records
of the 1054 guest star provided the crucial historical link. Today, the Crab Nebula supernova of 1054
CE is recognized as one of the most important events in the history of astronomy, and the Chinese
records of its observation are among the most cited historical astronomical documents in modern
scientific literature. Without these records, the origin of the Crab Nebula might never have been
established with such certainty.
Halley's Comet (哈雷彗星)
China holds the distinction of maintaining the earliest and most continuous record of Halley's Comet
appearances in the world. The earliest Chinese observation of what is now known to be Halley's Comet
dates to 613 BCE, recorded in the Chunqiu (Spring and Autumn Annals). From that date forward,
Chinese astronomers documented over thirty appearances of this famous comet as it returned to the
inner solar system every 75–79 years.
In ancient Chinese texts, comets were described using various terms, including "broom star"
(扫帚星, sàozhǒu xīng), "penglai star" (蓬星), and other descriptive names based on the shape and
direction of the comet's tail. Chinese astronomers were meticulous in recording the dates of first
appearance, the direction and length of the tail, the constellation or mansion in which the comet
appeared, and the duration of visibility. This level of detail has allowed modern astronomers to
confirm many of the ancient sightings as definite observations of Halley's Comet, providing valuable
data for studying how the comet's orbit and brightness have changed over thousands of years.
The continuous Chinese record of Halley's Comet is especially important because it helps fill gaps
in the European and Middle Eastern records, which are more fragmentary for earlier periods. By
combining Chinese observations with those from other civilizations, astronomers have been able to
reconstruct the comet's orbital history with greater confidence, extending reliable calculations
back to the earliest Chinese sighting.
Sunspots (太阳黑子)
The observation of sunspots — dark regions on the surface of the Sun caused by intense magnetic
activity — is often associated with the invention of the telescope in early 17th-century Europe.
However, Chinese astronomers were recording sunspots centuries before the telescope existed, using
careful naked-eye observations made during atmospheric conditions that dimmed the Sun's glare
(such as dust, haze, or the Sun's position near the horizon).
The earliest Chinese sunspot observation dates to 28 BCE, during the Western Han Dynasty. The
Han Shu (汉书, "Book of Han") records that in the third month of that year, "the Sun was
yellow, and a dark vapor was seen in its center, large as a coin" — a vivid description that modern
astronomers interpret as a large sunspot group visible to the naked eye under favorable conditions.
Over the following centuries, Chinese astronomers accumulated more than one hundred sunspot records
before the European invention of the telescope, far predating Galileo's telescopic sunspot
observations of 1610 CE.
These ancient sunspot records are of considerable value to modern solar physicists. Because sunspot
activity follows roughly eleven-year cycles, and because long-term trends in solar activity have
important implications for Earth's climate, the Chinese records provide data points that extend our
understanding of solar behavior far beyond the limits of telescopic observation. Studies using these
records have contributed to research on the Maunder Minimum (a period of extremely low sunspot
activity in the 17th–18th centuries) and other long-term variations in solar output.
Aurora Borealis (极光)
Chinese records of aurora borealis — the shimmering curtains of light caused by charged solar
particles interacting with Earth's magnetic field — date back to the Han Dynasty (206 BCE–220 CE).
In ancient Chinese texts, auroral displays were described using poetic and evocative language:
"the heavens opened their eye" (天开眼), "colored qi appeared in the north" (北方有色气),
or "a fiery light blazed in the northern sky." These descriptions, while colorful, are specific
enough that modern atmospheric scientists have been able to identify many of them as genuine auroral
observations.
What makes the Chinese aurora records particularly interesting is that some of them describe
auroral events visible at latitudes much further south than aurora are typically seen today. This
suggests that Earth's magnetic field — which determines where aurora are visible — may have been
different in the past, or that solar activity was intense enough to produce aurora at unusually
low magnetic latitudes. The Chinese records, combined with those from Japan and Korea, provide one
of the longest continuous datasets for studying the historical behavior of Earth's magnetosphere
and its interaction with the solar wind.
5. Tools & Instruments
古代天文仪器
The precision of Chinese astronomical observations was made possible by a series of ingenious
instruments invented and refined over centuries. These devices allowed astronomers to measure the
positions of stars and planets, track the Sun's annual motion, determine the dates of solstices
and equinoxes, and keep accurate time. Some of these instruments were centuries ahead of their time
in design and capability.
🔭
Armillary Sphere
浑天仪 · 张衡 (78–139 CE)
The armillary sphere (浑天仪, húntiān yí) was a mechanical model of the celestial sphere,
consisting of interlocking metal rings representing the celestial equator, ecliptic, meridian,
and horizon. The great polymath Zhang Heng (张衡) of the Eastern Han Dynasty built the first
water-powered armillary sphere — an instrument that could rotate automatically to track the
stars' apparent motion across the sky. Later refinements by astronomers of the Tang and Song
Dynasties produced increasingly sophisticated versions, culminating in the monumental
water-powered armillary clock of Su Song (苏颂) in 1088 CE.
⚙️
Simplified Instrument
简仪 · 郭守敬 (1231–1316)
The simplified instrument (简仪, jiǎn yí) was invented by the great Yuan Dynasty astronomer
Guo Shoujing (郭守敬), who recognized that the traditional armillary sphere was complex and
prone to errors due to the overlapping rings. His simplified design separated the equatorial
and ecliptic coordinate measurements into two independent devices, dramatically improving
precision. The equatorial mount of the simplified instrument anticipated the design of modern
telescope mounts by several centuries.
☀️
Sundial
日晷 · Ancient Timekeeping
The sundial (日晷, rìguǐ) was one of the oldest and most fundamental astronomical instruments
in China. By measuring the shadow cast by a gnomon (a vertical post) as the Sun moved across
the sky, ancient Chinese could determine the time of day and, over the course of a year, track
the Sun's changing declination. Elaborate stone sundials have been found dating to the Zhou Dynasty
and earlier, and the instrument remained in use throughout Chinese history.
📏
Gnomon
圭表 · Solstice Measurement
The gnomon (圭表, guībiǎo) was a device for measuring the length of the Sun's shadow at noon
on different days of the year. By tracking the shadow length through the seasons, astronomers
could determine the dates of the summer and winter solstices — the days when the shadow was
shortest and longest, respectively. This was essential for calendar construction. The most famous
gnomon was the one erected by Guo Shoujing at the Gaocheng Observatory (告成观星台) in Henan Province
in 1276 CE, a structure that still stands today and is a UNESCO World Heritage Site.
6. Legacy & Modern Significance
遗产与现代意义
The astronomical records left by ancient Chinese observers have proven to be of enduring scientific
value, far beyond their historical and cultural significance. In the modern era, these records have
been actively used by astronomers, astrophysicists, and geophysicists to study phenomena that span
centuries or millennia — time scales that modern telescopes alone cannot cover.
Historical Supernovae and Stellar Evolution
As the Crab Nebula example demonstrates, Chinese records of "guest stars" have been essential for
identifying the historical origins of supernova remnants. Beyond the 1054 CE event, Chinese astronomers
recorded several other possible supernovae, including the guest star of 185 CE (one of the earliest
recorded supernovae, possibly creating the remnant RCW 86) and the guest star of 393 CE. These records
allow modern astronomers to study how supernova remnants expand and evolve over centuries, providing
data that complements contemporary observations.
Cometary Orbits and Long-Period Comets
The continuous Chinese record of cometary appearances has been invaluable for reconstructing the
orbital histories of both short-period comets (like Halley's Comet) and long-period comets that
may have appeared only once in recorded history. By combining Chinese observations with those from
other civilizations and with modern orbital calculations, astronomers have been able to trace the
paths of comets over thousands of years, improving our understanding of the dynamics of the solar
system.
Solar Activity and Climate History
Chinese sunspot records, combined with aurora observations and radiocarbon dating of tree rings,
have been used to reconstruct the history of solar activity over the past two millennia. This research
is important for understanding the Sun's long-term behavior and its influence on Earth's climate.
The Chinese records have helped confirm periods of unusually high or low solar activity, including
the Medieval Maximum and the Maunder Minimum, contributing to the broader scientific understanding
of solar-terrestrial relationships.
Preservation and Digitization
In recent decades, significant efforts have been made to preserve, digitize, and make accessible
China's astronomical heritage. Institutions including the Chinese Academy of Sciences, the National
Astronomical Observatories of China, the British Library (which holds the Dunhuang Star Chart),
and various universities have undertaken projects to photograph, translate, and catalogue ancient
astronomical manuscripts. International collaborations have brought Chinese astronomical records into
dialogue with modern astrophysical research, ensuring that the legacy of four thousand years of
celestial observation continues to contribute to humanity's understanding of the universe.
China's astronomical heritage is not merely a national treasure — it is a world cultural treasure.
The star charts, catalogues, and observational records produced by Chinese astronomers over millennia
represent one of the most sustained and systematic efforts to understand the cosmos ever undertaken
by any civilization. Their preservation and study enrich our shared human heritage and continue to
yield scientific insights to this day.
Frequently Asked Questions
The Dunhuang Star Chart, dating to approximately 700 CE during the Tang Dynasty, is one of the
oldest complete star maps in the world. Discovered in the Mogao Caves at Dunhuang, it depicts
over 1,350 stars organized into 257 Chinese star groups (xīng guān). It is currently preserved
in the British Library and is recognized by UNESCO as a Memory of the World document. However,
if we consider star catalogues rather than visual maps, the Gan Shi Xing Jing compiled
by Gan De and Shi Shen in the 4th century BCE predates it by over a millennium.
The Suzhou Stone Carving Astronomical Map (苏州石刻天文图) is a star chart carved on a stone stele
in 1247 CE during the Southern Song Dynasty. It records over 1,440 stars organized into the
Three Enclosures and Twenty-Eight Mansions system, with the Milky Way clearly depicted. It stands
in the Suzhou Confucian Temple and is one of the oldest surviving stone-carved star maps in the
world. Its accuracy has been confirmed by modern astronomical calculations accounting for the
precession of the equinoxes over the past seven centuries.
Yes. Song Dynasty astronomers recorded a "guest star" (客星) in July 1054 CE that appeared near
the star Tianguan in the constellation we now associate with Taurus. It was bright enough to be
visible in daylight for 23 days and remained visible to the naked eye for nearly two years.
Modern astronomers confirmed in the 20th century that this event created the Crab Nebula (M1),
making the Chinese record one of the most important historical astronomical observations ever
documented. Without these records, the origin of the Crab Nebula might never have been established
with such certainty.
The earliest known star catalogue is the Gan Shi Xing Jing (甘石星经), compiled by Chinese
astronomers Gan De (甘德) and Shi Shen (石申) during the Warring States period in the 4th century BCE.
It catalogued over 800 stars organized into 121 star groups, predating the famous Hipparchus star
catalogue of ancient Greece by approximately 200 years. Though the original texts have not survived
in their complete form, substantial portions were preserved through quotations in later Tang Dynasty
works, particularly the Kaiyuan Zhanjing.
Timeline of Key Astronomical Records
重要天文记录年表
4th Century BCE
Gan Shi Xing Jing (甘石星经)
World's earliest star catalogue by Gan De and Shi Shen, cataloguing 800+ stars in 121 groups.
28 BCE
Earliest Sunspot Record
Han Dynasty astronomers record "a dark vapor" in the Sun, the earliest confirmed sunspot observation.
185 CE
Guest Star of 185 CE
Possibly the earliest recorded supernova, visible for eight months, now associated with remnant RCW 86.
78–139 CE
Zhang Heng's Armillary Sphere
The great polymath builds the first water-powered armillary sphere for tracking celestial motions.
c. 700 CE
Dunhuang Star Chart
Tang Dynasty star chart on silk, 1,350+ stars in 257 groups, now in the British Library.
1054 CE
Crab Nebula Supernova (SN 1054)
Song Dynasty astronomers record the guest star visible in daylight for 23 days — the origin of the Crab Nebula.
1088 CE
Su Song's Astronomical Clock Tower
Song Dynasty engineer Su Song builds a monumental water-powered astronomical clock with armillary sphere.
1247 CE
Suzhou Stone Carving Astronomical Map
Song Dynasty stone stele recording 1,440+ stars, now standing in the Suzhou Confucian Temple.
1276–1280 CE
Guo Shoujing's Instruments
Yuan Dynasty astronomer invents the simplified instrument (简仪) and builds the Gaocheng Observatory gnomon.
