Brittany in West France has a remarkable number of megalithic monuments but in the South an area of great concentration near the town of Carnac. Analysis of these contributed greatly to Sacred Number and the Lords of Time as demonstrating numerical counting of days within monuments which, combined with multiple square geometries, indicates an advanced megalithic science there in the fifth millennium BC. Day inch counting would have enabled the harmonic structure of synodic time to have been discovered just as the neolithic civilisations of the fourth millennium arose, especially in the ancient near east.

Figure 1 The entrance of Crucuno's cromlech, which opens to the south-east [Summer Solstice, 2007]

Crucuno Dolmen entrance 600

It is not immediately obvious that the Crucuno dolmen (figure 1) faces the Crucuno rectangle about 1100 feet to the east. Dolmens appear to have been used to mark the beginning significant time counts. At Carnac's Alignments there are large cromlechs initiating and terminating the stone rows which, more explicitly, appear like counts. The only (surviving) intermediate stone lies 216 feet from the dolmen, within a garden and hard-up to another building, as with the dolmen (see figure 2). This length is interesting since it is twice the longest inner dimension of the Crucuno rectangle, implying that lessons learned in interpreting the rectangle might usefully apply when interpreting the distance at which this outlier was placed from the dolmen. Most obviously, the rectangle is 4 x 27 feet wide and so the outlier is 8 x 27 feet from the dolmen.

Crucuno Outlier 600

Figure 2 The in-town outlier to the east of the Crucuno dolmen. [photo: Robin Heath, 2007]

Momentarily at least, one can consider the two lengths of (210-) 216 feet relating to 108 feet of the rectangle and I believe dolmen to centre of rectangle  to be about 1105 feet. The combined monument is then as figure 3.

GE CrucunoComposite

Figure 3 The combined monument seen within satellite data, showning two key dimensions in white, the section above magnifying the in-town components.

The Metrological Key to Crucuno

Carnac2007 018 200The area around Carnac in Brittany is peppered with uniquely-formed megalithic designs. In contrast, Great Britain's surviving monuments are largely standing stones and stone circles. One might explain this as early experimentation at Carnac followed by a well-organised set of methods and means in Britain. What these experiments near Carnac were concerned with is contentious, there being no appetite, in many parts of society, for a prehistory of high-achieving geometers and exact scientists. Part of the problem is that pioneers interpreting monuments are themselves hampered by their own preferences. Once Alexander Thom had found the megalithic yard as a likely building unit, he tended to use that measure in isolation to the exclusion of other known metrological systems (see A.E. Berriman's Historical Metrology.) Similarly, John Neal's breakthrough in All Done With Mirrors, having found the foot we still use to be the cornerstone of ancient metrology led to an ambivalent relationship to the megalithic yard. For example, Neal's interpretation of Crucuno rectangle employs a highly variable set of megalithic yards and has perhaps missed the simpler point which supports his foot-based metrology as implicit within the Crucuno rectangle; this monument was said by Thom to be a "symbolic observatory" of the sun: that is an educational device, whilst Neal found the geometry of squaring the circle which, we see later, was the Rectangle's main metrological meaning. 

CrucunoRectangle ThomandThom MRBB 19 800

Figure 1 Alexander Thom's survey of Crucuno Rectangle by Alexander Thom, see MRBB, 1978, 19 & 175-176