- Category: Carnac
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Figure 1 The entrance of Crucuno's cromlech, which opens to the south-east [Summer Solstice, 2007]
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.
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.
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
- Category: Carnac
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In 1973, Alexander Thom found the Crucuno rectangle to have been "accurately placed east and west" by its megalithic builders, and "built round a rectangle 30 MY [megalithic yards] by 40 MY" and that "only at the latitude of Crucuno could the diagonals of a 3, 4, 5 rectangle indicate at both solstices the azimuth of the sun rising and setting when it appears to rest on the horizon." In a recent article I found metrology was used between the Crucuno dolmen (within Crucuno) and the rectangle in the east to count 47 lunar months, since this closely approximates 4 eclipse years (of 346.62 days) which is the shortest eclipse prediction period available to early astronomers.
Figure 1 Two key features of Crucuno's Rectangle
About 1.22 miles northwest lie the alignments sometimes called Kerzerho, on the present D781 before the hamlet Kerzerho - after which they were named - on the way north to Erdeven from Plouharnel. These stone rows are the start of a major complex monument but here we consider only the section beside the road to the east. Unlike the Le Menec, Kermario and Kerlestan Alignments, which start north of Carnac, Kerzerho's alignments are, like the Crucuno rectangle accurately placed east and west.
Figure 2 Two stones, angled to the diagonal of a 3-4-5 triangle 235 feet from north west stone and setting sun at summer solstice. The diagonal appears counted in 235 feet as to the Metonic period