The Maes Howe alignments are not singularities.
Stonehenge is shown to have been used in similar light
(See Aubrey Burl, Stonehenge) As well there are
similar sightings documented in Ireland not only for
Samhain and Belteine but Imbolc as well.
Somewhere around here I have some sites regarding
paleo archeoastronamy bookmarked, will be glad to send
them on to you today or tomorrow (nursing a fractured
molar at the moment, awaiting dental surgery)
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