Other
Scientific paper
May 1974
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974rspta.276..149t&link_type=abstract
Philosophical Transactions for the Royal Society of London. Series A, Mathematical and Physical Sciences, Volume 276, Issue 1257
Other
Scientific paper
The accuracy of megalithic man's linear measurements is shown by recent work in Orkney and Brittany. Everywhere his geometry is based on integral right-angled triangles. The Sun was observed at the solstices and equinoxes. The fact that the foresights for the latter show a declination of + 0.5 degrees and not 0 degrees proves that the year was divided into two equal parts. By similar analysis of other foresights the megalithic calendar has been established. The evidence that the Moon was observed in its extreme positions is extensive but the most interesting sites are those which show the small perturbation of the inclination of the lunar orbit. To establish the necessary sight lines some method of extrapolation was necessary. The actual sectors used for this are found in Caithness and in Brittany. Alinements at Le Menec perhaps provide an adjustment for the varying speed of the Moon in its orbit.
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