The Same Sky, Different Worlds

The same physical sky does not mean the same cultural map

In the article “How Stars Become a Constellation” we saw that a constellation is not a three-dimensional object floating in space as a figure. From Earth we see the apparent positions of stars and connect them into patterns. Modern astronomy then also began using constellation names for precisely defined regions of the sky.

When culture enters the equation, the picture becomes even more interesting.

The same arrangement of bright points can support several different maps. One tradition may connect five stars into one figure, another may place three of those stars in a different pattern and the remaining two in a third. In one place, a particular star cluster may be most important; elsewhere, a broader part of the Milky Way may carry greater significance. Some names are linked to animals, others to social order, ancestors, tools, landscape, or stories.

The International Astronomical Union today has Commission C5 devoted to cultural astronomy precisely because the relationship between people and the sky is not only a history of astronomical measurement. In different societies, the sky has been integrated into timekeeping, orientation, narratives, ritual, ecology, and understandings of the world.

But it is important not to make the opposite mistake and say that everything is completely arbitrary. People were not drawing on an empty canvas.

Some stars are distinctly brighter. Some groups are highly compact. The Milky Way has visible structure. Certain celestial phenomena recur. The sky therefore constrains the possibilities, while culture selects, connects, and interprets within those constraints.

The sky does not come with lines already drawn

The easiest way to understand the difference is to forget the lines we see in star atlases and apps. They are not present in nature.

If two cultures observe the same part of the sky, they do not have to agree on which stars belong together. This is not merely a matter of giving a different name to the same figure. The very structure of the map can differ.

Traditional Chinese astronomy demonstrates this well.

The Hong Kong Space Museum notes that Chinese astronomy developed independently and had its own system for connecting stars. A historical catalogue associated with the astronomer Chen Zhuo during the Three Kingdoms period combined 283 asterisms and 1,464 stars. Later tradition also organized the sky into the Three Enclosures and the Twenty-eight Mansions.

This is a substantially different division from much of the Greco-Roman tradition from which many names of modern Western constellations descend.

The International Dunhuang Programme, which preserves and studies the famous Dunhuang Star Atlas, shows that Chinese grouping of stars differed from the Greek tradition of large figures. The atlas contains numerous smaller asterisms associated with the imperial court, officials, places, objects, and other elements of the cultural world of its time.

If we placed the same stellar coordinates beneath a Chinese and a Greek sky map, we would therefore not simply obtain two languages for the same lines. We would obtain two different systems of lines.

Matariki, the Pleiades, and Subaru — the same star cluster, different meanings

An even more direct example is a small star cluster that most people under a dark sky can readily see with the unaided eye: the Pleiades. Physically, we are talking about the same open star cluster.

In Greek tradition, the Pleiades are associated with the “Seven Sisters.” In Japan the cluster is called Subaru; the Subaru Telescope of the National Astronomical Observatory of Japan was named after it. In Māori traditions of Aotearoa, the cluster is known as Matariki and holds an important place in astronomical and cultural knowledge.

But even within this single example, we have to avoid oversimplification.

Te Papa Tongarewa explicitly notes that there is not one single version of Matariki shared by every iwi. Some traditions emphasize seven stars, others nine. In some regions Matariki is not readily visible at the relevant time and another star, such as Puanga, heralds the New Year period. Stories and associations differ among iwi, hapū, and whānau.

This matters because we sometimes use the phrase “different cultures” as though each culture were a single fixed box with one correct map. Local, family, and historical variations also exist within cultural traditions.

Matariki, the Pleiades, and Subaru therefore do not show that people are looking at three different physical objects. On the contrary: the fact that we can identify the same star cluster in all three cases allows us to see how the same observed phenomenon can be integrated into different systems of meaning.

The same star cluster can remain the same astronomical object without having to be the same cultural object.

The Chinese sky is not merely a different list of names

With the Pleiades, the group of stars is so visually distinctive that comparison can quickly become mainly a question of names and meanings. The Chinese example shows something deeper. A culture does not merely choose a story for a ready-made Western pattern. It can divide the entire sky differently.

In the traditional Chinese system, many stars are arranged into smaller asterisms. The Twenty-eight Mansions follow a region important for the movement of the Moon and other celestial bodies, while the northern sky was organized into images connected, among other things, with the imperial court and social order.

In the famous Dunhuang atlas, the oldest known complete star atlas preserved to the present, the sky is mapped in a system that cannot be translated simply by replacing each Chinese pattern with one modern Western constellation.

The boundaries and groupings do not correspond one-to-one. This is a very important lesson for understanding the cultural sky. If we begin with today’s 88 constellations and then ask, “What did other cultures call Orion, Taurus, or the Big Dipper?”, we have already accepted one map as the basic grid and forced all others into it.

Sometimes that is practical for comparing coordinates. But it is not neutral if we want to understand how a tradition itself organized the sky.

When the figure is not made of stars: the Emu in the dark lanes of the Milky Way

Perhaps the strongest example of how differently observers can direct their attention comes from Aboriginal Australian traditions. The so-called Emu in the Sky is not a conventional figure formed by drawing lines between bright stars.

Much of its shape is formed by dark clouds and lanes in the Milky Way. The dark Coalsack near the Southern Cross can represent the head, while the remaining dark structure extends through the bright band of the Galaxy.

Here the observer’s attention is directed not primarily toward bright points, but toward the negative space between them.

A peer-reviewed study by Robert Fuller, Michael Anderson, Ray Norris, and Michelle Trudgett describes in detail the knowledge of Kamilaroi and Euahlayi communities and also reports that accounts of a celestial emu are widespread among different Aboriginal Australian language groups. That does not mean that all groups have an identical name, story, or use.

The University of Melbourne, working with knowledge holders, has described for example the names Gawarrgay in Euahlayi tradition and Gugurmin in Wiradjuri traditions. Here we see another level of difference.

Two people may look toward the same region of the Milky Way, but one has learned to search for bright stars and recognize a cross or a scorpion among them, while another attends to the form of dark clouds between bright regions.

The physical stars and dust clouds are the same. The selected visual signal is not the same. This is a clear example of how culture can influence not only what something means, but also what we learn to direct our attention toward.

Culture selects, but not from nothing

Examples like these can tempt us toward the claim that we see in the sky only what culture tells us to see. That too would be too simple.

The Pleiades really are a compact and conspicuous cluster. Orion’s Belt really is a striking row of three bright stars. The Milky Way has real bright and dark structure. The Coalsack is an actual dark cloud of interstellar dust that obscures light from stars behind it.

A cultural sky map is therefore not created without contact with reality. It is better understood as a selection from real perceptual possibilities. That selection is influenced by stellar visibility, latitude, seasons, local horizon, ways of life, language, narratives, social organization, and the questions a community needs or wishes to ask of the sky.

It is therefore not surprising that conspicuous patterns attract attention in more than one tradition. A bright, compact cluster has a greater chance of being noticed and named than a random grouping of barely visible stars. But this still does not mean that it will everywhere contain the same number of members, receive the same figure, or carry the same meaning.

Reality imposes constraints. Culture organizes attention within them.

Different maps are not different universes

The article “One Reality, Many Maps” argued that several maps of one reality do not imply several realities. This article shows the same principle in the sky. When Greek, Māori, Japanese, Chinese, or Aboriginal Australian traditions organize the same celestial region differently, it does not follow that each has its own physical universe.

A star has a particular position, distance, spectrum, and motion regardless of the name we give it. A star cluster remains a physical group whether one community calls it Matariki, another Subaru, and another the Pleiades.

But the opposite claim would also be mistaken: that cultural names and patterns are therefore unimportant additions that can simply be discarded. Cultural sky maps tell us what people observed, how they remembered the sky, which relationships they recognized in it, and how they connected celestial phenomena with life on Earth.

Modern astronomy needs standardized coordinates, names, and regions for scientific communication. That is a different task from preserving cultural knowledge. One system does not have to be dismissed as myth simply because another serves precise measurement.

We need to know which question we are asking.

What different sky worlds tell us about perception

When we look at these examples together, a pattern appears. First there is the physical sky: stars, star clusters, interstellar dust, their brightnesses, positions, and motions. Then there is perceptual selection: which points or dark regions stand out from the background at all.

Next comes grouping: what we treat as one group and where that group ends. Then comes naming: what we call the pattern. And finally meaning: which story, practice, time system, or view of the world we place it within.

These levels are not identical, but they are connected. That is precisely why the night sky is such a good laboratory for the question THY-REALITY has followed since its first article: what is the relationship between what is and how we organize it in perception?

The sky teaches us two kinds of humility. The first is scientific: our lines are not drawn between the stars in space. The second is cultural: the map familiar to us is not the only way people throughout history have meaningfully organized the sky.

The same physical sky can support several human maps. The difference between them does not erase reality — it reveals how much work the observer does in making sense of it.

The article “The Sky as the First Calendar and Compass” takes the next step. The question is no longer mainly what people saw in the sky, but what they did with the sky. How did observing stars, the Sun, and recurring celestial cycles help people know when a particular part of the year was approaching and which direction they were traveling?

The article “The Sky as the First Calendar and Compass” continues that theme.