Read 1458 times when last published on MatrixOfCreation.co.uk, Wednesday, 16 May 2012 14:22
At megalithic sites, the only alignment of note on the northern horizon has usually been the direction of the north pole or “true” North on the site plan. “Megalithic” cultures worldwide, both the later manifestations in the Americas or the old world cultures of Northwest Europe or Egypt, built structures oriented in a very accurate way to North. The builders of the Great Pyramid for example or of the geo-glyphs of the Amazon rainforest, seemed to have had an unexpectedly good method for determining North, no easy task when a pole star is never exactly north and, in many epochs, there is no star near to the pole.
Without modern equipment naked eye astronomers were better measuring the extreme elongations, in the standard angular measurement of angles on the horizon, measured clockwise from zero degrees true North., to east and west of suitably bright circumpolar stars. The two most obvious stars to choose are the magnitude 2 stars of the Great Bear and Little Bear constellations, now called Dubhe and Kochab. Other stars in these constellations could also be used in 4000 BCE, such as our present pole star Polaris (tail star of Ursa Minor) and the tail star of Ursa Major, Alkaid (Arabic: “the head of the mourners”, the big dipper then being seen as a Bier). The diagram below shows how circumpolar star describe a circle every time the Earth rotates. To East and West, each star will then achieve a maximum elongation to east or west, where it will stand above the horizon and can therefore be measured as to its azimuth or bearing – the angle relative to north on the horizon.
At Le Menec, there is good evidence that the primary marker star was Dubhe, alpha Ursa Major (see The Meaning of Le Menec). Having established this method as possible and likely for megalithic circumpolar astronomers, the horizon to the north becomes far more meaningful as regards A name special to Carnac's three successive groups of parallel rows of stones, starting above Carnac called Le Menec, Kermario, and Kerlescan and another found near Erdevan. that previously could only be noted or explained based upon symbolic or geometrical interpretation. One such feature is the 18 degree alignment to north found to emanate from the base of the Grand Menhir or Er Grah, to the east of Le Menec. The “Tumulus of Er Grah” looks like a shadow for the menhir, a low level and extensive structure made of rocks and orientated relative to the north, as in this charming diagram below that is looking north.
An archival Google Earth shows the site from above, as follows:
One must remember that in the ancient past, societies seem often to have created a spiritual centre upon the Earth by placing a singular standing stone which was then given polar associations, the pole indeed getting its name by being an invisible pole to the north that defines the axis of the (turning of the) World. In this case, the tumulus invites a search for a suitable star around 4000 BCE, that whould have had a maximum angle to north of around 18 degrees west. CyberSky 5 enables such a search to be relatively easy to reveal the star Alkaid, eta Ursa Major, as having a maximum elongation (to east or west) of just over 18 degrees around 4700 BCE, see below.
The two stars at opposite ends of the constellation Ursa Major, both magnitude 2, could both be used as significant markers for accurately determining north and then also available for tracking the rotation of the earth, Dubhe at Le Menec’s western Breton word for a rounded kerb monument or stone circle. as (described in The Meaning of Le Menec) and Alkaid at Er Grah in Locmariaquer. The literary association of bears with the pole evolved into the polar myth of King Arthur, whose name derives from that for bears and the arctic, as expressed in a drawing by Hachette:
Figure 5 A Bear on a pole held up by the Chinese acrobat but reminiscent of the polar god Druva, who stands on one leg and holds up the sky on a nail.
Below: I repeat figure 6 of The Meaning of Le Menec in which the initial stones have alignments to the eastern maximum elongations of circumpolar stars in 4000 BCE. Row 6 from the north starts with a stone that was aligned with Dubhe, then deliberately aligned to the cromlech’s easternmost point since the forming circle of the cromlech’s egg shape could then represent the circular path of Dubhe during the rotation of the Earth.
The angles generated by circumpolar astronomy for specific stars will increase in horizon azimuth angle as latitude upon the earth, for sites, increases. Long Meg in Cumbria, Northern England, is a stone ring at latitude 54 degrees and 44 minutes. Long Meg’s ring is a north-facing Type B flattened circle that appears also to point to Alkaid but at a maximum elongation to east and west of north equal to 20.5 degrees because of the higher latitude of the site. However, the characteristic V-shape of alignments is quite similar to that for Er Grah, as can be seen in Figure 7.
The menhir Er Grah would be at the bottom of the V-shape and the west of north angle of its tumulus is symmetrical with a feature made by archaeologists who were looking for the ancient remains of holes large enough to accomodate the fallen Grand Menhir. No hole big enough was found but rather a sequence of holes used for smaller standing stones. Exact bearings are not known and it is therefore clear wherefrom the alignments should be measured. However, when Le Menec’s western cromlech is considered, there is no need for a menhir at the backsight from which observations are made and a good amount of ancient work would only have been possible if done using wood and rope.
Later articles look more deeply into the possible circumpolar astronomical alignments of Locmariaquer’s Er Grah complex and their relation to events to the east and west.
The next article uses a 2004 film of Locmariaquer visit to introduce some interesting features of this monumental complex.