The lunar symbolism of kerb stone 78 at Knowth

This is kerb stone 78 at Knowth, located not far from the entrance to the western passage. It is one of 127 kerb stones at Knowth, of which 90 have megalithic art. But what do these symbols represent, if anything? Are they merely art for art’s sake?

Kerb stone 78 at Knowth. Picture © Anthony Murphy

American artist Martin Brennan published a book called The Stars and the Stones in 1984, having studied and drawn the megalithic art on almost all of the known decorated prehistoric stone sites in Ireland. Brennan’s overall supposition was that the ancient engravings at Neolithic sites such as Newgrange, Knowth, Loughcrew, and many others, were related to astronomy. His book was later republished as The Stones of Time.

The main plank of Brennan’s hypothesis was that the megalithic mounds and art are “interconnected, sophisticated calendar devices”. The summary on the back cover of the book says:

At critical times of the year, the rising or setting sun projects beams of light into the inner chambers of the mounds, illuminating specific images carved on the stones. Those images – seemingly abstract wheels, spirals, and wavy lines – suggest provocative new insights into their makers’ understanding of celestial cycles and the importance of those cycles in human affairs.

Brennan’s interpretation of kerb stone 78 (which he labelled as stone NW4 in his own personally devised numbering convention) is that it contains a diagrammatic representation of the moon through the use of what he calls “bijections or one-to-one correspondences with the phases of the moon”.

Brennan suggests that lunar imagery predominates on the kerb stones on the western portion of the great kerb of Knowth, where the crescents and arcs that dominate the imagery were generated by an interest in the moon and the division of time long before the age of mechanical clocks.

The crescents, waved lines and circles on Kerb 78 represent the phases of the moon, according to Brennan.

A ribbon-like development of the wavy line extends from the central image. The line follows a sequence shaped to fit the lunar month. The wavy line is transformed into crescents and then a full circle or full moon on the fourteenth count. A line divides the rest of the month, towards the end of which the crescents revert to the wavy line at the last quarter, defining a month of 30 days.

He proposed a second way of ordering the month using a different interpretation of the symbols. The top line counts from the first day of the moon as far as the seventeenth day, which is the day upon which the moon begins to wane. The sequence continues at the bottom of the stone, as far as day 27 and the last visible crescent. A final three-count wave represents the three invisible days of the moon.

Brennan's alternative lunar month count for kerb stone 78, Knowth.

The number 17 is often treated with special significance in connection with the moon, he says. "It may have had significance in a calendar of ritual. Usually it is the seventeenth phase of the moon which appears on the horizon and projects a beam of light into the mounds."

Brennan’s work is not without its detractors, and the analysis and categorisation of megalithic art has been an area of debate and dispute. Some scholars argue that the megalithic art is abstract and non-representative. Brennan, however, develops a comprehensive thesis around the astronomical symbolism and, coupled with his team’s important discoveries at Loughcrew and Dowth*, it all makes for a fascinating interpretation.

Kerb stone 78 at Knowth.

* Brennan, along with Jack Roberts and others, discovered that the southern passage at Dowth is aligned so that light from the setting sun on winter solstice reaches the stones at the rear of its circular chamber. They also discovered that Cairn T at Loughcrew is aligned so that a stone with solar emblems at the rear of its chamber is bathed with sunlight at dawn on the vernal and autumnal equinoxes.

Further reading

Knowth: archaeological and astronomical legacy

Knowth's Calendar Stone
The 19-year Metonic Cycle of the moon

Anthony Murphy (Mythical Ireland) with Martin Brennan at Newgrange.

The 12 days of Solstice - Day 8 - megalithic art on kerb stone 52, one of three highly decorated kerbs

This is kerb stone 52 at Newgrange, which lies at the rear of the mound, exactly opposite the main entrance kerb stone. It is one of just three highly decorated kerb stones at Newgrange. The others are kerb 1, the kerb immediately in front of the entrance to the passage, and kerb stone 67, on the northeastern side of the kerb.

As you can imagine, interpretation of the symbols carved into stone at Newgrange and its sister monuments over 5,000 years ago is necessarily subjective, and there is a wide range of theories as to what various emblems and designs on different stones mean. My own view is that there's no great harm engaging in speculation - however, one has to be careful about ensuring that the archaeological evidence is not disputed by your theory. For instance, one gentleman I encountered some years ago insisted that symbols on a passage stone at Cairn T, Loughcrew, were figures including the biblical partriarch Jeremiah, sailing on a boat to Ireland. This same individual insisted that Newgrange is an Iron Age construction, and all the archaeologists are wrong about its date!

My own theory (and because it's just a theory, I could be wholly wrong about it) is that it might contain symbols representing Orion and Sirius. At the time Newgrange was built, around 3150BC, the declination of Sirius was -23º 2' 43.1". This means that its rising position would make it visible from the chamber of Newgrange, out through the roofbox. A prostrate observer on the floor of the chamber could have seen this "dog star" (or whatever it might have been called back then) night after night at certain times of the year. However, due to the effects of precession of the equinoxes, a slow wobble of the earth's axis, Sirius's declination was increasing, and over the next couple of centuries it would have drifted northwards, so that it was no longer visible from the chamber.

Some of the engravings on kerb 52 could be interpreted as representations of Orion's belt and Sirius:

On the right-hand side of the stone, there are three sets of three circular holes, known in archaeological terminology as "cup marks". Each of these sets of holes is contained within a double oval-shaped cartouche. There are a number of other cup marks on the stone, the most noticeable of which is one contained inside the vertical stripe in the centre of the stone. Is this Sirius, sitting on the axis of the site, which runs through the entrance kerbstone, K1, up the passage, and out the other side of the kerb in the centre of K52?(1)

Maybe it is, maybe it's not. This is the nature of speculation. But at the very least this theory fits the astronomical evidence and does not dispute the archaeological evidence - always a good starting point!

The presence of the vertical line or stripe on this stone led archaeologists to speculate that there might be another passage behind it. Prof. Michael O'Kelly excavated an area of the mound behind this stone in search of just such a passage, but no evidence of one was found.

References:
(1) Murphy, Anthony and Moore, Richard (2008) [2006], Island of the Setting Sun: In Search of Ireland's Ancient Astronomers, Liffey Press, p.178.

Time lapse footage shows dramatic eclipsing of Dowth's solar eclipse symbols on Stone of the Seven Suns

The above video is a time lapse sequence showing the Stone of the Seven Suns (kerb stone 51) as it is lit up dramatically after sunrise in early December, with just two weeks to go to the Winter Solstice. The video features almost half an hour of footage compressed into one minute and 30 seconds. The symbols on the stone are thought to represent the sun, or perhaps even the sun during a solar eclipse, with ties in with the mythology about Dowth which suggests that its construction was abandoned when a sudden darkness fell over the land.

The time lapse footage reveals something fascinating. At first, the solar symbols are lit up quite dramatically, so that they are shown in excellent relief. Then, as the sun rises moves towards the south, a shadow from another kerb stone falls over the sun symbols - eclipsing the symbols one by one. If you can, make sure to watch the YouTube video at 1080 HD and full screen.

Kerb 49 (arrowed) is the one that casts
the shadow on kerb 51. Also shown here
is kerb 50, with its vertical line.

Unfortunately there was cloud blocking the sun early on, so the first of the seven sun symbols, which is on the far left of the stone, is already in shadow when the sun comes out. However, that does not spoil the show. Sit back and watch this marvel of megalithic magic! One can only speculate as to whether this "light and shadow" show was intentional on the part of the builders. The shadow from kerb stone 49, which is two stones to the left of the Seven Suns stone, causes the eclipsing of the symbols on kerb 51. However, it can be seen that kerb 49 leans forward somewhat (K49 is arrowed in the picture on right), and one has to be mindful about the possibility that this lean has happened in more recent times and was not, perhaps, part of the original design.

However, this interaction of light and symbols reminds me somewhat of the illumination of symbols that are not dissimilar to Dowth's seven suns on the back stone of Cairn T at Loughcrew. These symbols are lit up by sunrise on the spring and autumn equinoxes.

The interplay of light and shadow is also suggested at Newgrange, where shadows from the Great Circle stones appear to point towards, or "touch", kerb stones at the front of Newgrange at certain important times of the year, as described by Frank Prendergast.

Although I've been to Dowth several mornings lately to watch how beautifully the sun symbols are illuminated, I hadn't realised the extent of the phenomenon, or the slow progression of the shadow, until I saw the time lapse video. The video was made by taking a photography every two seconds. Because it compresses time, it shows the effect much more vividly.

The sun symbols lit up by the low winter sun. The shadow has not yet eclipsed these emblems.

The shadow crosses the stone diagonally, and interestingly the last sun to remain illuminated is the one which is currently at ground level. I presume the original Neolithic ground level is several inches below the current ground level and that the lower part of this symbol is hidden from view.

At around 9.15am, as shown in the above photo, the shadow from K49 is crossing the diagonal line on K50. Within about 15 minutes this shadow will have completely crossed K50 and will begin its slow progression across K51, eclipsing the eclipse emblems as it does.

The shadow from K49 is almost half-way across K51, the Seven Suns stone.

There is undoubtedly more to be learned about Dowth. It continues to provide surprises. Even though its mythology suggests a summer solstice influence, we can see the midwinter sunrise also has a dramatic "wakening" effect upon the few eastern kerb stones that are revealed. This is by far the best time of the year to view the Stone of the Seven Suns. At most other times, the megalithic art appears to be very flat and is sometimes difficult to see.

We shouldn't forget either that Dowth's southern passage and chamber are aligned so that the light of the setting sun on winter solstice shines inside, as shown in these beautiful photos by Anne Marie Moroney.

Winter sunlight does some beautiful things with the ancient megalithic art on the stones at Dowth

I've been able to spend a few mornings at Dowth recently. It's one of three of the great monuments of Brú na Bóinne (the others being Newgrange and Knowth), but is the least visited of the trio. Personally, I'm glad that Dowth retains this almost-forgotten status. It is not on the official tour. It is wild and overgrown, and many of its secrets are in the deep slumber of many centuries. I like it that way. It's a lovely place to spend time. Despite the fact that it is named after darkness (Irish Dubhadh), it presents a very interesting notion - the belief that we must experience the darkness of the longest night before the new year dawns.

Winter sunrise at Dowth, the third great passage-tomb of the Brú na Bóinne complex.

While it near neighbour Newgrange is famous for its winter solstice sunrise alignment, Dowth's alignment to the sunset on the shortest day is less well known. Discovered (rediscovered) in 1980 by Martin Brennan and Jack Roberts, it was studied in detail over the course of a number of winters by Anne Marie Moroney, who published a lovely little book about it called Dowth: Winter Sunsets.

While the focus at Dowth is undoubtedly centered around winter sunset, there is something really beautiful that happens just after the sunrise on these short days of midwinter. The very well-known kerb stone 51 at Dowth, more famously referred to as the Stone of the Seven Suns (named so by Martin Brennan), is gloriously lit up by the warm luster of the midwinter sun. For about an hour after sunrise, these ancient solar symbols are highlighted in a dramatic fashion by the acute angle of the low sun. As a photographer who has spent many years photographing this stone under various lighting conditions, I can safely say that I have never seen them so impressively and dramatically in relief. It's quite striking. Below are a couple of photos showing some of the megalithic carvings, which are thought to be up to 5,500 years old, lit up by the winter sun.

Some of the solar emblems on the Seven Suns Stone lit up by the low winter sun.

The megalithic art is highlighted in dramatic and pristine fashion by the acute angle of sunlight.

The Stone of the Seven Suns is on the eastern side of the great mound of Dowth. Curiously, over on the southwestern side, the entrance stone to the southern chamber is also lit up by the morning sun in winter time. This is due to the alignment of the stone, which is orientated roughly northwest-southeast. There are two large cup holes on the stone, referred to by some as 'Lucy's Eyes'. There is also some worn megalithic art, which appears to be part of a spiral. A good bit of the stone is still buried beneath the ground - only the top third or quarter is visible above the surface.

The spiral and cup marks on the entrance kerb. I added flash to this one because the sunlight was a bit watery.

For a place that is named after darkness, the sun plays a big role at Dowth. It penetrates the southern chamber at midwinter, as we know. Until recent centuries, it probably also shone into the northern chamber around the time of Samhain and Imbolc sunsets (November/February). And there may be undiscovered passageways within its huge bulk. But as I said before, some of its secrets are in slumber. For now at least. And that's just the way I like it.

See more photos of Dowth.