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near Little River, Victoria, Wathaurong country, Australia

Wurdi Youang

Aboriginal, and undated (solstice and equinox alignments, with no excavation date)

Part of the arrangement. Three stones sit in dry grass, patched with yellow lichen. A bag lies against them. Hills close the horizon. The photograph does not label these stones as the outliers or the western apex. Ray Norris, CC BY-SA 2.5. Shown unedited.

Near Little River, about 100 basalt stones make an egg-shaped ring about 50 metres on its long axis, which lies within a few degrees of east–west. A 2013 survey found outlier stones lined up with the setting sun at the equinox and at both solstices. No dig has dated the ring.

Why this is extraordinary

On Wathaurong country near Little River, about 100 basalt stones form an egg about 50 metres long. The long axis sits within a few degrees of east–west. The stones are small, from about 0.2 metres, up to uprights about 0.75 metres. At the western end, the high end, three stones about 0.6 metres high are propped with trigger stones. The ground drops about 4 metres toward the east. An estimate of the whole mass is about 23 tonnes. The site was registered in 1977. There is no written ceremony that says who stood the stones or when.

A sunset calendar is simple to describe and strict to test. At the equinox the sun sets due west. At the two solstices it sets as far north or south of west as it will that year. From a gap between the large western stones, outlier stones lie toward those three setting places. A 2013 theodolite survey found the equinox and the summer line good to about 2 degrees and the winter line to about 3. The straighter sides of the egg point the same three ways, a second set of indicators that does not depend on the outliers. A shuffle of fake rings, keeping the stones in the same general patch, left about a 0.25 percent chance of the outlier score. The paper says the model is rough, and that choosing which stones are “obvious” can bias it. It also says the outliers are easy to kick out of line, and the propped western stones are not.

Many Aboriginal traditions time food and ceremony by the sky. The survey says that, and it does not record a Wathaurong story that names these sunsets. The sun itself will not date the ring. Its setting place crawls so slowly that a check for the year 1788 still serves an older century. No other Victorian arrangement is yet published with the same solstice-and-equinox pair of indicators.

What this changes: if the outliers are still where they were set, this is a solar marker in stone, and the missing fact is the century under the western stones. If the small stones have moved, the east–west axis and the propped stones remain, and the degree-level sunsets are a pattern that needs to be measured again.

Why it matters

If the outliers were placed for those sunsets, Wathaurong country holds a stone calendar of the solar year, of unknown age. If the small stones have shifted, the match with the sun is a pattern that later movement, or a careful choice of which stones to count, can create.

The arrangement is also called the Mount Rothwell site, recorded as AAV 7922-001 and protected since 1977. It is on the country of the Wathaurong, or Wada Wurrung. Stones run from about 0.2 metres across to uprights about 0.75 metres high. Three larger stones, about 0.6 metres, stand at the western end, the high end. The ground falls about 4 metres from west to east. A combined mass of about 23 tonnes has been estimated. The academic survey withholds a precise dot. The pin here is the location already published for the site.

Photo tour

1 photograph, unedited. On a phone, swipe the row. Choose one to look closely.

Part of the arrangement. Three stones sit in dry grass, patched with yellow lichen. A bag lies against them. Hills close the horizon. The photograph does not label these stones as the outliers or the western apex. Ray Norris, CC BY-SA 2.5

What is still unexplained

These sit beside the consensus account, with the same visual weight. None of them is marked solved.

Open Sunsets over the outliers The sun sets due west at the equinox. At the summer solstice it sets south of west, and at the winter solstice north of west, as seen from Victoria. A viewing gap between two of the three large western stones looks over small outlier stones toward those three sunsets. The 2013 theodolite survey found the equinox and the summer alignment good to about 2 degrees, and the winter alignment to about 3. A second set of lines, along the straighter sides of the ring, points the same way. A Monte Carlo trial, shuffling viewing spots and outliers inside the same patch of ground, put the chance of the outlier pattern at about 0.25 percent. The surveyors also say that figure is rough, and that it does not remove the bias of deciding which stones are the obvious ones. The outliers are small and easy to move. The large western stones, propped with trigger stones, are not.
Open No date, and a sky culture that is wider than this ring There is no eyewitness account of the building or the use. The site is treated as Aboriginal because of its form, its place, and the heritage record, not because a ceremony at these stones was written down. Many Australian traditions use the sky as a calendar for food and ceremony. That is a true and widespread practice. It is not a story, in the survey, that names Wurdi Youang’s sunsets in Wathaurong words. The sun’s position changes very slowly, so the 2013 paper checks the sunsets for 1788, a last pre-colonial year, and notes that an older date would barely move them. An undated alignment can be recent or ancient and still point at the same sunset.
Open No second site of the same kind The survey ends on a limit. No other stone arrangement in Victoria is known to share this solstice-and-equinox pattern. Other rings in the south-east have been described as cardinal, east–west or north–south, and it is not known whether they also mark the solar extremes. One precise site is a site. A custom would be a second site measured the same way.

Location and dating

Location
Near Little River, between Melbourne and Geelong, on Wathaurong country. The pin is the published coordinate of the arrangement. The survey paper does not print a more precise dot.
Period label
Current consensus — open to revision Aboriginal, and otherwise unknown. No excavation date is in the 2013 study.
How this dating was done
The solar directions are archaeoastronomy, a theodolite survey checked against an ephemeris. The age is not dated. Heritage registration treats the arrangement as Aboriginal.
What could change it
A date from under one of the large western stones, the ones propped so they are unlikely to have crept, published with the azimuths already in the survey.

What is actually there

Open questions

Question Status
Were the outliers set for the solstice and equinox sunsets, or have small stones moved into a pattern? Open. The large stones are stable. The outliers are the ones a foot can shift. The survey’s probability is an estimate, and it says so.
How old is the ring? Open. The sunset barely moves across centuries. The sky does not date it.

The current narrative

Where publication stands today. It is the best-supported reading, and it is open to revision. It is not a verdict.

The current narrative — open to revision

A deliberate solar arrangement

The outliers and the straighter sides were placed to mark the setting sun at the equinox and the solstices. The match is unlikely to be an accident of a random ring. The builders’ calendar used the sun on the western horizon.

What supports this

  • Two independent sets of indicators, the outliers from the western gap and the sides of the ring, point at the same three sunsets.
  • The survey’s trial puts the outlier match near a 0.25 percent chance under its rules.
  • The western stones are large, about 0.6 metres, and propped, so the viewing end of the line is not a loose rock.

What pushes back

  • The outliers are small. The paper says they move easily. A moved outlier spoils the degree-level match.
  • The probability does not include the choice of which stones count as obvious. A different choice changes the score.
  • No date means the “builders” are not placed in a century, and no Wathaurong account of this ring is in the survey.

What would settle it

It is the centre because two sets of lines and a low chance estimate are a stronger case than a single east–west oval. It moves if the outliers are shown to have shifted, or if a second survey with a different set of “obvious” stones loses the sunsets.

Emerging narratives

Other published readings. Each may be right. None is adopted here unless the evidence carries it.

An emerging narrative

An Aboriginal ring whose sun is not yet secured

The arrangement is an Aboriginal stone ring of unknown age. The solar fit is a published hypothesis that still depends on small stones and on a statistical model the authors call rough. Cardinal rings exist in the region without this solstice claim.

What supports this

  • No excavation, no eyewitness, and no named ceremony for these stones.
  • The paper’s own limit, that no second Victorian site repeats the pattern.
  • Small outliers are poor pegs for a degree of azimuth.

What pushes back

  • About 2 degrees and about 3 degrees, on two different parts of the plan, is a lot of accident in one egg shape.
  • The long axis is already within a few degrees of east–west, which is the equinox on its own, before the outliers are counted.
  • Heritage protection since 1977 treats the place as an Aboriginal site, so the “unknown” is the century, not the makers’ tradition in the broad sense.

What would settle it

It stays because the age is empty and the outliers are movable. It is not the centre while the survey’s two sets of lines still point at the same three sunsets.

Should the current view be reevaluated?

Open to revision

The alignments are the best-measured fact, and they come with the survey’s own warning about small stones and about statistics. The age is open because nothing under the stones has been dated. Open keeps the solar reading and the undated ring together.

What drives this

  • Outlier sunsets within about 2 and 3 degrees, and a second set along the sides.
  • A chance estimate near 0.25 percent, called rough in the same paper.
  • No excavation date, and no second site of the same pattern.

This is the museum’s own weighing of the evidence. It is not a visitor vote, and it is separate from the slider.

Weigh it yourself

Anonymous. Nothing here is stored except on this browser. Your lean does not change the assessment beside it.

A deliberate solar arrangement Unsure An Aboriginal ring whose sun is not yet secured

If the contested reading is right

What would follow if a reading that is not the consensus turned out to be true, and what could settle it. This explains the stakes. It does not adopt the reading.

The outliers were set for the solstices and the equinox

A stone solar calendar would be part of the archaeology of this part of Victoria, and its age would become the next dig. Other cardinal rings in the south-east would be worth the same theodolite treatment, to see whether Wurdi Youang is alone.

Why it is still worth a test

A date under a propped western stone, and the same survey method on one more Victorian arrangement.

Sources

  1. Wurdi Youang, an Australian Aboriginal stone arrangement with possible solar indications Rock Art Research, 2013
  2. Open copy of the Wurdi Youang survey Rock Art Research
  3. Wurdi Youang Wikipedia, for the published coordinate

Image credits

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