Special Access to Stonehenge & Avebury July 16-17th


The Megalithomania team have asked me to guide this double weekend event, which will provide a rare opportunity to focus on Stonehenge and its landscape, and also include the monument’s connection  with the Waun Mawn stone circle and Woodhenge and Avebury.  

My contribution will be ‘interactive’ so participants become involved with quite a number of practical models, through assessing the astronomical, geometrical and metrological properties of these monuments, via direct personal contact, in order to validate statements made elsewhere on this website, in my own (and other’s) various books, and from information gleaned from alternative sources. Private access into the centre of Stonehenge provides a chance to fully experience perhaps the most famous megalithic stone circle in Britain, and find out why it has become so special! 

Enquiries: go direct to the megalithomania.co.uk website for further details. Current Covid restrictions will apply for this outdoor group event.

Recent work at Waun Mawn stone circle including the equinox sunset at 18:31pm on 21/3/2021


Megalithomania2021 – Presentation – The working script


Prior to the availability of the film of my recent presentation, I thought some attendees would appreciate having the working script, without the slides, to chew over.

I will endeavour over the next few days to put some of the slides in with it, but the work load becomes big on our holding at this time of year. I expect it will depend on the weather!

Have fun, y’all!  Robin


The sole remaining standing stone in the circle at Waun Mawn. [21/03/2021 18:31pm]


An illustrated presentation at Megalithomania 2021

by Robin Heath



Hello, I’m Robin Heath and I’m here today to widen and augment the research recently undertaken by a team of archaeologists, led by Professor Mike Parker Pearson, at Waun Mawn, in my home patch of the Preseli Hills in coastal West Wales.

This work was the subject of a BBC2 documentary, entitled Stonehenge: The Lost Circle Revealed.. First shown on Feb 12th 2021.


There can be few places left in the British Isles that have retained such a sense of remote wildness as does the Preseli landscape. Largely forgotten by the modern world, its many Megalithic monuments were placed here by a prehistoric culture that has been almost totally forgotten, regarded as ‘primitive’ and therefore much less than our present culture.

The Preseli region contains some of the most significant surviving megalithic monuments to be found in Britain, and most of the notable archaeologists during the past few centuries have been here in an attempt to make sense of it all. They did not succeed in answering the two golden questions: why were they built and what were they for? There are historical and social reasons why they did not succeed. One of those reasons was succinctly summed up in a Guardian article on 7th Nov 2020 when our latest visiting prehistorian, Professor Mike Parker Pearson , was quoted with, “When we’re looking at prehistory, the buried remains are the only evidence we have”. I think this single remark goes a long way to explaining the ingrained reluctance by archaeologists to take into account the above ground surface features and the connection that many if not all megalithic monuments have with their neighbours, the local landscape and with the principal astronomical cycles as they are observed from any particular site. Sadly, this has resulted in a pretty well complete rejection of the work of archaeoastronomers, and other alternative researchers whose work is based on the surface.


If you want to understand a megalithic landscape, I have found that you must focus on the ground – the liminal space between above and below, between sky and landscape, at locations where Neolithic folk sited their temples and other monuments.

The techniques required are quite different from those presently employed by archaeologists. Let me use this presentation to demonstrate what the inclusion of these techniques can bring about in terms of a deeper understanding of the purpose and raison d’etre of the temple buildings from our most distant and forgotten past. You can then decide whether this material is an aberration from the lunatic fringe or is something much more significant.


The Waun Mawn stone is the weightiest stone of the Waun Mawn collection.

It is located 600m along the gated farm track, on the right, and a little over 1000 feet from the remains of the (claimed) stone circle, whose few surviving stones lie just over the slope to the left of the stone in this photograph.

In Welsh, it has also been known as the Dragon’s Head, [Pen Ddraig] or the Druid (or Monk) of Waun Mawn, ]Mynach y Waun Mawn].


These stones may not be megalithic. Some local archaeologists have suggested they are boundary stones from a later epoch than the Neolithic period. As it happens they are not significant to my present presentation. Their similar size and tilt angle makes these stones curiously interesting. From the middle point between then looking Northwest, one can see the large Waun Mawn stone…..[ 891 feet away].


This slide shows that these four stones may form an arc of a once complete stone circle. To confirm this requires that the researcher identifies the position of this circle’s centre, and from there, can then go on to determine the best-fit radius, diameter, and circumference. This is the principal task at this site.


From some angles there is a similarity in the profile of the large Waun Mawn stone and its smaller sister up the nearby hill to the north east. This slide shows the large difference in size between these two standing stones, using the metrological unit of a British Standard Wife as the comparison unit of measure. For most of the year the larger stone lies in a circular moat of clear water, The symbolism of which should be obvious to all.




Possible Problems

All four stones are spaced along a narrow arc

Two of these long stones now lie recumbent – which end was buried and which end once rose aloft?

As over a third of all stone rings are not circles, how might anyone know if this example was once circular or not?



This kit is the minimum required to determine the centre position of this arc, and hence to complete the circle. In addition to the kit here, displayed on the flat top of the recumbent Stone One, we must add stakes, a mallet, my camera, a flask of tea, sandwiches and suitable clothing and footwear.

This site lies above 1000 feet amsl. Take care and do not forget how quickly the weather can change up here, from a superb day on the moors to a type of wetness and coldness beyond belief. For much f the year this kind of work would be ill-advised. So Let’s crack on.


By a miracle of modern technology, this slide is able to show how Stone One would look if it were raised onto its present southern end. It makes a perfectly acceptable menhir but was this its original location?


Or is this where it was located, raised up onto its present northern end?

It cannot be both, Unless it was deliberately laid flat, then a choice will have to be made to support the result of this survey.


STONE TWO is PRIME DATE. It is the sole surviving Standing stone and it has a small footprint, making it invaluable as a location that has a high importance as a source of reliable data within this survey.



The Stone hole is still evident to the left of this stone.

This also is a clue, for its base also has quite a low cross sectional profile and thereby acquires a high significance. The message overall is that this stone fell to the right, as shown.

If so, then notice the curious bent top on this stone. It would be an ugly beast raised up to the right.


STONE FOUR is most likely a STUMP. It is recti-linear in x—sectional area,

It has been presumed to be in its original intended location. If you hit it with a mallet, a low frequency thump informs of a much larger underground component lurking beneath. The stump has a low profile, being the x-sectional area of what was probably a sizeable standing stone.

STONES 2, 3 and 4 all yield data that suggest a reliable interpretation as to their original. From their X sectional profiles, its now possible to confidently find the dimensions of the circle they may have been once part of.


Google Earth is a miraculous tool that enables an accurate and even calibrated Bird’s-Eye view to be rapidly obtained. The FOUR STONES are clearly identified in their true positions and it is possible to draw a reasonably accurate circle to fit all of these. The circle shown is not the only circle that can be drawn, but the one that has assumed STONE ONE was originally tipped up onto its present southern end.

STONE TWO, our highest probability location, has been used to ascertain the ‘best-fit centre’ within the assumption above.

Circle Two takes stone one and assumes it was originally erected in a hole located at its present northern end.


125.5 feet radius. 251 feet diameter

This FIRST model

assumed that STONE ONE was originally raised on its (present) southern end.


This slide shows how this fundamental measurement is made. The centre is found by using a rope, of unmarked length, and a technique of successive approximation. Trial and error determines the circle’s centre. NO measurements have yet taken place.

NEXT.. A chalk line was scribed onto each stone denoting where the end of the circumference rope passed over each stone.

NO measurements have yet taken place. A best-fit centre has been established.

Only later, after the centre has been marked, is the tape employed to measure the radius from the centre to all four stones.


This slide shows how this fundamental measurement is made. The centre is found by using a rope, of unmarked length, and a technique of successive approximation. Trial and error determines the circle’s centre. NO measurements have yet taken place.

NEXT.. A chalk line was scribed onto each stone denoting where the end of the circumference rope passed over each stone.

NO measurements have yet taken place. A best-fit centre has been established.

Only later, after the centre has been marked, is the tape employed to measure the radius from the centre to all four stones.


Here an 18 inch cold chisel has been driven into the soft peat to mark the proposed centre point. I emloyed 100 foot tapes, accurate to better than one inch per 100 feet, and for longer lengths I would chain them together end on end.. Thus, in the SLIDE ABOVE above, we read (100ft) + 41 feet and 9.7 inches = 141.8 feet, as the RADIUS of the best-fit circle. ( our CIRCLE TWO – where STONE ONE is located on its present northern end.


STONE 2 (& 4) are prime data because it would appear that they remain in their original location. They also give another advantage because their cross sectional area – their footprint- is small.

A good rope that does not stretch (much!) when tensioned or when wet (or very dry) and is stable in length is recommended. I have some surveyors chains made of a special alloy and 100 feet in length, but these weigh an enormous amount compared to a rope.

You will need to work with an assistant, and you will at times end up shouting, confusing left and right, and yelling and even swearing at each other from a distance of several hundreds of feet distance – This is great fun to observe for the casual visitor.


A SECOND MODEL assumes that STONE ONE was originally located or set onto its present NORTHERN END.

The radius is 141.8feet.

Diameter = 283.6 feet.

The centre was found by using a rope, of unmarked length, and a technique of successive approximation.

The radius length of 142 feet derives from the technique – it was not predetermined.

This length of radius offers the best fit to all four stones.


Having determined the best fit of a rope to the stones, the centre is defined. The end of the radius rope was then walked once again over the four stones and a chalk line made on the path where the end of the rope passed during this confirmatory journey. Here we see the northern end of Stone One and see the ’circumference’ line passing about two feet up from its pointed base, assumed to be the end that was originally buried in the stone hole, The chalk line is augmented by the starry pathway.


Here we discover that the circumference passes quite close to the flat far edge of stone 2. Follow the stars. The earlier assumed circumference line is to the left, unstarred.


The starry path of chalk now passes over the stones assumer original base.


This starry path passes over the centre of the ‘stump’. This concludes it’s journey, with a radius of 141.8ft. Using the fundamental method of employing a rope to find the centre of the arc made by these four stones, we have arrived at what appears to be the location of the centre, within a few inches in nearly 142 feet, or better than 99.5% accuracy.


This proposed circle does not fit the four remaining stones. Before all the conspiracy theorists amongst you nod knowingly, you need to consider that there may be good reason for this apparent failure to mate their proposed circle up with all the four surviving stones. It may be that the archaeologist’s proposed centre is a best fit based on the position of some newly discovered stone holes that my surface survey would not be capable of assessing. I dig sacred sites, I do not dig at sacred sites.


This slide shows the two circles –the blue circle being the ‘best fit’ derived from the four remaining stones, the white circle presumed to be the ‘best fit’ derived from these four stones plus some newly discovered stone holes identified by the archaeological team.

This second option would suggest Stone One has been moved four feet to the south since it fell over.


  • The four stones are the only visible (above ground) evidence.
  • The best-fit from this evidence is either the 125.5ft or the 141.8ft radius circle, depending on which end of Stone One was originally raised.
  • The 141.8ft circle has stronger links to Stonehenge!
  • These putative circles were found by using an unmarked rope to ascertain the radius, walking back and forth many times, to and from the stones, prior to using a tape measure to measure the radius.
  • This is geometrical evidence placed on the table for all to pick through. Metrological and astronomical evidence can now follow on from this summary.
  • Now, for those who haven’t already twigged on, the best-fit circle emerging from the survey, turns out to be very significant INDEED. It is identically sized to the mean RADIUS   of the centres of the Aubrey Holes, Following by Richard Atkinson and Alexander Thom’s closed traverse survey of the entire monument during 1972 and 1973. Who says that academic archaeologists cannot work with megalithic scientists?
  • Atkinson was the doyen of Stonehenge at the time, and Thom was the founding father of modern archaeoastronomy and then the man who identified Megalithic Science as being the integration of Astronomy, Geometry and Metrology..
  • In the Journal for the History of Astronomy – Volume 5, part 2, No 13, June 1974, Thom wrote of the Aubrey circle that
  • The standard deviation of the holes to the radii is 0.56 feet and the mean radius is 141.8 feet, plus or minus 0.08 feet.’
  • This means that about two-thirds of the 56 Aubrey Holes holes (37) had been dug within 6 inches (half a foot, or 15cm) of a perfect circle 283.6 feet in diameter.
  • It is hardly necessary to suggest that the most pressing question that needs answering is not whether the Waun Mawn circle once carried the bluestones that were taken to Stonehenge, but rather ‘what is the meaning underpinning the evident need for both circles to share the same dimensions?’ Whether they were all bluestones or the same bluestones in both locations becomes rather less important if we can answer ‘why 283.6 feet diameter/’ Later I can provide some of answers to this last question.


Measured distance between stones – straight chord

S4 – S3 = 37.88ft

S3 – S2 = 35.311ft

S2 – S1 (northern end) = 93.525ft (2 stones in the gap i.e. 3 spaces

S1 – S4 is six stones, 5 spaces, in 164.72ft/5 = 33.34ft per gap

Average STONE SPACING (360 ft diameter circle)   =     1131ft/33.34ft = 33.92 feet [34]

Circumference of the 141.8ft radius circle = 891ft (2 x pi x 141.8ft)

number of stones = 891ft/33.34ft                                 = 26.72 stones [27]

Circumference of the 180ft radius circle =1131ft (2 x pi x1131)

Number of stones = 1131/33.34ft = 1131ft/ 33.23ft = 33.92 stones (34)


I have some history with this stone going back to 2007. A theodolite survey I undertook in 2008 suggested it is had been GEODETICALLY LOCATED. I want to show you what came up during this survey (in Bluestone Magic, 2010)



This menhir was located here to complete a geodetically active pattern onto the local landscape, including Pembrokeshire’s most iconic monument PENTRE IFAN. Let’s now have a look at how this pattern looks from above.


The FOUR SITES shown here are arranged to define the corners of two equilateral triangles.

Two of these sites are enhanced natural features that include megalithic site(s).

Three sites are themselves megalithic in origin, Pentre Ifan being archaeologically dated to pre-3500 BC.

At Fachongle there is a 4ft high megalith at the central point.

The central site was the principal birthplace in Wales of the recent self-sufficiency and New Age movement in Wales.

The neighbouring farm is the Brithdir Mawr community.

Several TV doccos have centred on these two locations as places where big social changes have and still are taking place.


  1. Defined by 4 prehistoric sites, ina double diamond shape or rhomboid (GEOMETRICAL KNOWLEDGE) Nevern Castle (The VSW motte); An NBC near the summit of Carn Ingli which is due west of…; Pentre Ifan (eastern point); Waun Mawn as the southern point.
  2. Aligned to the Cardinal points. (ASTRONOMICAL KNOWLEDGE required) is clearly a bonus point. It confers astronomical knowledge on the surveyors who set up this shape, and is not just clever geometry. In addition, the 7.00 miles circumference circle provides the researcher with evidence of metrological knowledge and asks serious questions concerning prehistoric familiarity of our present imperial measures that has evidently survived through the various epochs whilst its cultural source has been forgotten, lost or quashed, perhaps by deliberate intent.

So, 3. Circumference = 7.00 miles (METROLOGICAL KNOWLEDGE). This is 6.00 Russian Miles, perfectly matching the hexagon nature of the geometry of the Vesica Piscis.



Hello, Plato!

The triangle’s sides average at 11760 feet. I have used feet because it’s an ancient unit, tied in to other units from the ancient world. I could have used any old unit of length, even made up my own, say the Flutney, made up a rule defining one flutney in length and presented the same diagram in flutneys. But, whether you presently believe it or not, the ancient world used inches, various types of feet, cubits, remens and megalithic yardsThe implications of this are enormous, and pose such a big question to historians thay most choose to ignore this easily proven fact,

In units of ‘Russian’ Feet, (Psst!..that’s 7/6ths of an ‘English’ foot), the DIAMETER of the circle becomes, numerically, Plato’s recommended choice for the diameter of a circular Temple, at 10080 Russian feet. Well, Fancy that!!

Put together, This appears to be THE geometry of a Neolithic Temple, pre 3500BC. It might now be wise to be looking at just how accurately it was surveyed.



The ‘Monk’ of Waun Mawn forms one of a set of accurately located geodetic markers which comprise a network of geometrically placed monuments – two back to back equilateral triangles – a rhomboid – and the basis of the Vesica Piscis. The average length is 11,760 feet plus or minus 70 feet.

Over rough terrain this is quite an achievement in itself, and suggests knowledge of 60 degree chaining, where a single arm or side length – a BASE LINE – was carefully measured out and then flipped across the landscape using 60 degree angles from each end. And.. DAMBUSTERS.

The OS made the survey of GB this way.


The Vesica Piscis is a geometrical construction based on two intersecting circles each of which has its centre placed on the circumference of the other circle.

The construction frames two equilateral triangles that share one of their sides, to form a diamond or rhomboid shape.

An EAST-WEST line drawn through the centre shows that the geometrical construction effectively divides a line into three.

The two circles define a double square or a two by one rectangle (see next slide).

It is the basis for the construction of the type B Flattened circle (LONG MEG as example). The geometry of this elegant shape is based on a triple square (3 x 1 rectangle)

The Vesica Piscis is a very ancient geometrical and religious symbol of generation and of the creation of new life.

The circumference of each of the circles shown as a dotted yellow circumference is 14.00 miles.

Funny, that, eh? DISCUSS!!


The value of the remen used here is 1.216512EF = 6/5ths EF x GF (1.01376EF).

The Double Square enables many irrational numbers to be generated – ROOT 3, ROOT 3 AND ROOT 5. Using the ‘geographical’ remen as the side lengths melds these irrationals into four of the commonest units of length that have been identified with the prehistoric world.

We can now usefully look next at the ASTRONOMY of the WAUN MAWN ASSEMBLY, beginning by taking a 20 minute stroll down to Brynberian Bog. Don wellies!


Anyone like watching sunrises? Just a mile and a half down the road from Waun Mawn, in the boggy lands just below Brynberian, there’s a prehistoric monster. Or so the welsh name for the site would have us believe. Bedd Yr Afanc means the grave of the monster, although the dictionary also gives us ‘beaver’. Perhaps people were quite a bit smaller then?

This site is hard to find and sometimes dangerous to approach. The land around eats wellingtons, and folk have vanished forever here, sometimes on horses. This is also true, so be warned and be careful.. Stay safe.

But if you want to watch the best equinoctial sunrise in town, here’s a ready made observatory! IT still works because the equinox will always have the sun rising dead east and setting dead west, on a level horizon. At the spring equinox, successive sunrises move along the flat plateau that connects Foel Drygarn to Frenni Fawr. The equinox position is marked by a ruinous cairn marked on the OS map, about the sun’s diameter, to the left. Successive sunrises at the autumn equinox are blocked by Foel Drygarn as the equinox approaches, and each day the sun rises more to the south, the right.

So where must one position oneself in order that the peak of Foel Drygarn can be where the sun sits at BOTH Spring and Autumn equinoxes?? Let’s find out!


This is rather like parking a car in Cardigan. The very spot we need has already been utilised. Some inconsiderate Neolithic people went and stood a large stone at the spot, a clever trick because, as we will now discover, it serves BOTH SPRING and AUTUMN equinoxes, this dividing the SOLAR YEAR into two more or less equal parts. Summer Half and Winter Half.


This location is well met at Wawn Mawn, where the flat topped stone (That’s stone 2 of the circle) provides a great backsight, for those prepared to get up off their own backsight and get up to the site for around 6:30 am on potentially sunny mornings around the time of the Spring equinox. [I’ll return to this astronomical function later].




THIS SPOT, the spot we need has already be utilised. Some Neolithic people stood a large stone at the spot, a clever trick because, as we will now discover, this site then serves BOTH SPRING and AUTUMN equinoxes, both sunrise and sunset, thus dividing the SOLAR YEAR into two more or less equal parts.

Stone 2 to Stone 1 aligns to the last flash of the setting sun against the horizon at the equinox.

If Stone 1 was once erected on its present northern end, the last flash of the sun setting into this stone would mark the transitions into both the light side (spring equinox) and the dark side (autumn equinox) of the year.

The tip of stone 1 can just be discerned on the right hand side of the level top of Stone 2.

Perhaps this long recumbent stone should be awoken, re-erected to resume this function. What do you think? Take it to The Repair Shop?


Pentre Ifan is our best known prehistoric monument, featuring as the Logo of the Pembrokeshire National Park, and mucstone and earth visited. It has the bluestone been dated to around 3500BC, and thus precedes the constructions at Stonehenge. Originally it was covered within a large mound. There are two things about Pentre Ifan that many people have not realised. The first it that it is built on quite an unexpectedly steep slope,, as the slide demonstrates. The capstone points into the valley bottom. The other thing that remains unnoticed is that if one were to stand on the top of the capstone, (once the top of a large earth mound), one can see the bluestone outcrops and Foel Drygarn on the Preseli ridge. One of Pembrokeshire’s great men, the Elizabethan father of geology, George Owen, reckoned one could ride a horse under the capstone .

The fields immediately behind the monument are level, a rarity in the Preseli region. We need to take a walk in Pentre Ifan’s back garden.


The slab or VBS 9 very big stone). How it was noticed.


This huge megalith – number 2 in the photo below – comes with an ‘earth-fast’ dolmen alongside it.

The three stones (see left) are arranged in a triangular pattern.

Number 1 is interesting!…..?? Wanna go see it?


Carningli peak in the background overshadows the whole area around Pentre Ifan. Here we find an anomalous and rare flat field of some acreage, directly behind Pentre Ifan. A triangular arrangement of individual stones roughly arranged or so it would appear. I have learned over many years that it pays to look real close at any stones placed near to a highly significant megalithic monument


The angle of slope of this INTRUIGING megalith is just a wee bit over twenty-six degrees from the vertical.


Now, anyone who knows me well would tell you that I wouldn’t want to ever upset anyone who has already made up their mind on any subject., and non-negotiable about new information that might change, that viewpoint, just a wee tad.

From now onwards, if you think that you fit that category, it may be wise to make a sandwich or take a break.


A line struck across towards Pentre Ifan, from the centre of the Waun Mawn circle, makes the same angle as the Leaning Stone of Pentre Ifan at the slab. It measured 10.786 feet in length. Now 10,786 INCHES is the outer circumference of the Aubrey circle at Stonehenge, which corresponds to an outer diameter of 286ft 1.25inches., measured by Atkinson, Thom, North, Wood other notables This line has an azimuth angle of 26.5 degrees. Which is also the angle associated with the diagonals of a double square or a 2 by 1 rectangle.

It appears (on the slide below) to be the same angle as the leaning stone, which all seemed like a massive coincidence far beyond coincidence, so I built some kit to measure the stone’s angle more accurately.


Here’s my gear set up against the stone’s side. It takes the form of a 1 : 2 :root 5 triangle, the wooden frame equipped with a horizontal precision level and a confirmatory plum line and bob to ensure the vertical angle is set right.

The stone’s leaning angle is very much the Angle of double square!

Note Pentre Ifan in the background, LURKING BEHIND THE HEDGE ON THE RIGHT.


When the centre of the Waun Mawn circle is now joined to the summit of Foel Drygarn, the line of the equinoctial sun, the angle and length defines the outline of a double square,


Completing the right angled triangle (1:2:root5) gives half a double square. I have assumed that the leaning stone behind Pentre Ifan was integrally part of the original monument


If we now add the measured lengths of the sides, then we may explore something quite unexpected and totally extraordinary. The shortest side, the 1 side in 1:2:root5, at 10.786 feet long, is also the product of the solar year and the lunar month.


The longest side also holds a similar cargo of astronomical significance – being SY x LM x root 5, which is also 66 x SY, or 66 solar years. This is twice the 33 year solar repeat cycle. 33 years is also12,053 sunrises, which would have to be tallied as 12053 day light periods. Time as Lengths, again.


– The St David’s Alignment –

This observatory enables the annual quarter day ‘loss of count’ to be observed and tallied, so that a correct 365.25 day tally can be tracked.

This site makes it possible to record the super-annual repeat cycle of the sun, after 33 years (12,053 sunrises) have been tallied.

Ever wondered why the number 33 is allocated to Solar Heroes? At Brainport Bay, in Argyll, Dr Euan MacKie and Dr Peter Gladwin found a well rotted leather bag just under the observing platform of an equinoctial site. In it’s remnants were 33 quartz pebbles, now held and displayed at the nearby Temple Wood museum. Having suggested to Euan that the 33 pebbles were related to the solar repeat cycle, he lit up like an equinoctial sunrise and we immediately made a trip to the museum and went over the evidence!


So here’s the deal. This presentation has shown that there are many things about this enigmatic site, ASTRONOMICAL QUALITIES, GEOMETRICAL DESIGNS AND METROLOGICAL METHODOLOGIES that are very strange to modern eyes, but clearly part of the organic whole that was the Waun Mawn complex. I have shown scientific evidence that these qualities form part of a previously unrecognised cosmology, but were not noticed., They were passed over in a single goal or mission, that of identifying where the Stonehenge bluestones originate or came from, where, for maybe four centuries, they were placed to fabricate this largest stone circle in Britain before paying a visit to Salisbury Plain, Wiltshire.

There is much more that can be presented in a single hour. There are many more megalithic sites than one person can get to visit let along understanding within a single lifetime. More people are needed who can do something other than just feel good at these sacred sites, which is also wonderful, but perhaps you need to ask why it feels wonderful to hang out at sites. This lost legacy from prehistory can take you on an astonishing journey of self-discovery, and can provide objective data that can be tested, rather than speculative models of the past.

So I’ll finish with this simple slide that kind of says it all for me, and hopefully for you.


10,768 feet = Solar Year x Lunar Month (days)

And, therefore, 24,118 feet = Solar Year x Lunar Month x (root 5)

This closely approximates to 66 Solar Years

or two solar repeat rising cycles of 33 years each.

These lengths represent principal astronomical time periods – Lengths of Time .



or even go mad and buy a Book or two! GO TO…

www.skyandlandscape.com or https://robinheath.info























Join me at the Megalithomania Online Conference on 8th – 9th May 2021. Discounted tickets available. Other speakers are listed on a previous post on this site, and include Mike Parker Pearson, Howard Crowhurst, Christine Rhome, John Martineau and Hugh Newman.  All at www.megalithomania.co.uk/booking.html. My lecture is scheduled for the Sunday, 9th May, start at 4:30pm and titled, Bluestone Magic: Revealing Waun Mawn

Brief Description 

To understand a megalithic landscape, one must focus on the liminal space between sky and landscape, where ‘the above’ meets ‘the below’ at locations where Neolithic folk chose to locate their major temples and other significant monuments. Unfortunately, the techniques required are not those preferred by present day archaeologists.

In his new richly illustrated presentation Robin Heath will share his latest research, which sheds new light on the function and purposes of the Waun Mawn site, in the Preseli region of West Wales, conferring a greater significance onto this monument than previously recognised.

Brief Biographics

Robin Heath is a seasoned researcher, author and presenter on prehistoric and ancient science, a subject that has become a lost legacy to the modern world but remains built into the design and construction of many megalithic monuments. Robin has written and published nine books, and co-authored a further two.

An engineering graduate, his background has enabled Robin to discover astonishingly elegant qualities in many Neolithic monuments, and reveal in their design an unexpected knowledge of astronomy, geometry and metrology. Robin’s goal is to see this subject incorporated within the history books of the future, a recovered legacy made plain for future generations, and recognised as the vital first chapter in any revised history of science.

Robin has lived for over 35 years in the Preseli National Park of coastal West Wales, 25 years with his wife Tricia.


Latest Schedule from Hugh Newman www.megalithomania.co.uk 


10.30am: Registration

11 am: Michael Bott & Rupert Soskin

12.00 pm: BREAK

12.30pm: Caroline Wise

1.30 pm: Lunch

2.30 pm: Dr Martin Sweatman

3.30 pm: Break

4 pm: Gail Higgingbottom pt.1

5 pm: BREAK

5.30 pm: Alan Wilson & Ross Broadstock

6.30 pm: BREAK

7.00 pm: Prof. Mike Parker Pearson

8.15 pm: END


10.30am: Registration

11:00 am: Gail Higgingbottom pt.2

12.00 am: BREAK

12.30 pm: Howard Crowhurst

2 pm: LUNCH

3pm: John Michell Memorial Lecture – Hugh Newman

Introduced by Christine Rhone

4 pm: BREAK

4.30 pm: Robin Heath

5.45pm: BREAK

6.15 pm: Speakers Forum hosted by John Martineau

7.30pm: Closing Remarks

7.45pm: END

2021 Megalithomania on-line conference details1

Coming shortly at a computer or iPAD near you. Here’s the poster for the conference, to whet appetites.

May 8th & 9th 2021.

Pembrokeshire people may enjoy finding out more about the Waun Mawn site. Loads of interesting topics to satisfy all megalithomaniacs!

More details from www.megalithomania.co.uk  phone inquiries:  01458746101

The Original Bluestone Circle, yes or no?

Waun Mawn – is this the site of the Original Bluestone Circle?

a) How to find the site

The Waun Mawn sites are accessed from the B4229 Eglwyswrw to Haverfordwest road, along a gated farm track by the cattle grid at Tafarn y Bwlch ( Lat 51*58′; Long 4* 47′). During the recent Documentary The Lost Circle Revealed, shown on February 12th we saw evidence that supports the old folk legend that an original bluestone stone circle was once taken from the Preseli Hills of West Wales to Stonehenge. I would like to suggest some comments that may be useful in assessing this evidence and clearing up some unfortunate confusions that appear to have been made in the presentation of the material.

During the week following the documentary I  received and answered over 90 emails , and one of the main issues raised by these correspondences was a confusion as to just which of the involved stones formed the Waun Mawn referred to during the documentary. The OS map shows three separate areas where standing stones are marked. Below, I have included photographs of all three sites. The OS Map allocates this ‘title’ to the higher reaches of the prominent hill Cnwc y Hydd, yet there are extensive peat bogs down to the lower levels, and mawn means ‘peat’ in Welsh.

Locating the Three Groups of ‘Waun Mawn’ Standing Stones

a) The Two Leaning Stones

Walking along the pathway to Gernos fach farm from the small parking area next to the cattle grid at Tafarn y Bwlch, the first two stones are found to the left of the gated track, around 300m from the large gate. These are small, less than three feet high, and very much an aligned pair, each sloping at the same angle to the west and about six feet apart.

b) The Solitary Waun Mawn Stone

This is without doubt the largest stone on the moor and it stands, with considerable presence, some sixty yards from the right hand side of the trackway some 500 yards from the entrance farm-gate. The side by side photographs show the difference in size between this whopper and the much smaller standing stone within the claimed bluestone circle.


Th larger stone forms the southern point of a large geodetic structure,  a diamond shape aligned to the cardinal points of the compass (N-S-E-W). Revealed through surveying in 2009 it was found to suggest a vesica piscis construction, with Pentre Ifan on the East, the Neolithic burial chamber near the summit of Carningli (West) and the weird and spectacularly sited second ‘motte’ at Nevern Castle (North).  This largest upright stone is the Waun Mawn I refer to in my book Bluestone Magic, a Guide to the Prehistoric Monuments of West Wales (available from website online book-shop and elsewhere).

b) The Remains of a Stone Circle?

To get to the third set of stones requires that one takes a right just after passing through the gate, and follows the track up are around to the right for about 400m, taking a left turn and walking uphill to a fairly level plateau where there are four clearly identified stones that appear to have once been originally set along a curve. The first stone (going left to right) is recumbent, about eight feet long, the second is the sole upright stone, of pleasing symmetry and remaining fully upright. This stone is frequently referred to by earth mysteries folk, dowsers and ley hunters, cited as being a highly energetic stone that can cause ‘tingling’ when held or touched.  The third is another recumbent stone, and similar in size to stone one. The fourth stone is much smaller than the rest.

If you visit this claimed stone circle and the weather is good, I cannot recommend highly enough the value of walking on up to the summit of Cnwc y Hydd, where there are some very special perspectives on the Preselis and beyond to enjoy from the summit.

I hope this clears up the matter of which Waun Mawn stones are which. Slightly misquoting the late archaeologist Jacquetta Hawkes I now hope you will all ‘get the Waun Mawn stones you deserve!

Since the Lost Circle documentary, and as we are enjoying the first dry sunny days since over three months of fairly wet, windy and impossible surveying weather conditions, I decided it would be fun to check the measures, geometry and astronomy now being offered by Mike Parker Pearson’s team during that recent TV documentary, who were suggesting a diameter of 361 feet (110 metres), a circle almost identical with the size of the outer bank at Stonehenge. This does not wholly agree with my own measurements, taken too many years ago, but the Preselis is a big patch for just one person to get around.  In due course I will report back. Watch this landscape!


The Recent Passing of Dr Euan MacKie

The recent passing of Dr Euan MacKie, together with the earlier passing (in April) of Dr Aubrey Burl,  and that of professor Keith Critchlow, brings to an end those stalwarts who were part of the surge of interest, during the 1960s and 70s, in archaeoastronomy, earth mysteries and a general quest to connect to our ancestors, to better understand the ancient world so as to include the new data that was pouring in from the work of those three professors, Gerald Hawkins, Alexander Thom, Fred Hoyle and those such as John Michell, whose lot it was to become part of, if not found, an alternative way of exploring  our ancient and prehistoric past, often tabbed  ‘the lunatic fringe’  within archaeological circles.

Continue reading “The Recent Passing of Dr Euan MacKie”

Durrington Walls Pit Ring – Part Two

Part Two: Redefining the Stonehenge Landscape

Durrington Walls Pit Ring is by far the largest known example of a megalithic egg, when compared with other existing types of ‘egg’, such as Woodhenge (Type II, Thom, 1967), just south of Durrington;  Allen Water, near Hawick,(Type I, Thom, 1967 ); and Castell Mawr henge in Pembrokeshire (Type III, Heath, 1916), adjacent to the ‘bluestone’ outcrops of Preseli, in West Wales. Other surviving examples of ‘Type III’ eggs, which have semi-elliptical ‘blunt’ ends, include Hirnant cairn circle in Montgomeryshire (Type III Hoyle, 1977), and Glasserton Mains rock art, on the Machan peninsula, Dumfries and Galloway (Morris and Bailey, 1967).

In Part One, the map of the pits around Durrington Walls was shown to clearly define the known geometry of a circular ended Type II egg, based on the locations of the many pits that make up the ‘pit ring’ discovery at Durrington. This geometry was compared with that of Castell Mawr.

Part Two shifts the focus to a metrological analysis of the shape of this pit ring, exploring its apparent properties and the relationship between Stonehenge and Durrington Walls pit ring ,  whose centre is located at a distance of just under 2 miles to the north-east of Stonehenge.

A New Circle around Stonehenge.

Stonehenge displays some similar qualities to the pit ring in that both monuments have identifiable centres and both have connections with megalithic constructions beyond their enclosing ‘walls’or ditch and bank, which extend out into the wider landscape. My earlier posts on Woodhenge provide a good example of such an extension to Stonehenge. Both monuments are also redolent with geometrical and metrological information, the kind of evidence that I routinely work with.

The investigation here identifies and quantifies these similarities, and  concludes by identifying a possible further large circle, concentric to, but set well beyond the present boundaries of Stonehenge’s bluestone, sarsen and Aubrey circles, and analysis will suggest a highly significant underlying purpose for such a circle’s existence. 

Continue reading “Durrington Walls Pit Ring – Part Two”

Exploring Durrington Walls Pit Ring

Part One:  Joining up the Dots

For pandemic reasons, the 2020 summer solstice sunrise gathering at Stonehenge was cancelled . The awesome sight of the rising sun over the Heel stone in line with the monument’s axis and the ‘avenue’ was replaced by an important discovery: A  huge ring of very deep and very wide pits had been discovered in the chalky subsoil around Durrington Walls, just two miles northeast of Stonehenge and a little north of Woodhenge.

The discovery of these pits is of great significance, and came in the form of a report of an on-going investigation report, the result of years of work by large team of archaeologists from many universities, and other specialists.

Due to the site’s proximity to Stonehenge – which is just under three miles to the southwest of Durrington Walls, the PR guys clearly thought it a good time to announce the launch at the summer solstice. The Guardian clearly thought so, coming on strong with this catchy title,

Vast neolithic circle of deep shafts found near Stonehenge : prehistoric structure spanning 1.2 miles in diameter is masterpiece of engineering, say archaeologists.”

Continue reading “Exploring Durrington Walls Pit Ring”

Avebury: Review of the recent OS-style map

The new ‘White Edition’ map of Avebury (megalithicmaps.com, 2019) should capture both hearts and minds, suggests Robin Heath.

Designer and collator Thomas Melrose has done what has been needed for many years – produced a superb graphical map of Avebury where all the stones are listed, all the recent archaeological evidence derived from LIDAR and aerial photography is included and, where applicable, shown on the plan. For the tourist or visitor it now becomes the must-have source material to have tucked away in a rucksack or large pocket during a walk around the Avebury Henge site.

But this new presentational format goes far further than this necessary accessory. Its accuracy is without doubt the best yet available to researchers, be they academic archaeologists or enthusiastic amateurs.

Continue reading “Avebury: Review of the recent OS-style map”