IMO, the human variable is also slightly missing in Galician (not Portuguese) rock art equinoctial lines, which were recently pointed out by a researcher (mathematician), using poles, shadows and taking into account prehistoric azimuths. Needless to say, he was lambasted by academia but some of the equinoctial allignments directly on islands off the coast, for me, look ok, precisely because they are the most simple and easy to confirm.
What you mention about the fissures is curious - many of these have been found to be *part* of the designs or the motifs slide out of them. As for the sloping of the rock I understand an allignment between the design itself (?) and the sky (?). In cup and ring complexes, often on flat (or very slightly sloping) surfaces, any orientation would require poles in the holes.
I'll have to look into the Scottish site at a later date, thanks!
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