A large percentage face north so there's no sun/moon link.
I just think they're a ceremonial court yard. The arcs of stones had dry stone walling between the orthostats (at least one - Behy in Mayo at The Ceide Fields - has a completely drystone court). This would have made a superb sounding board for a-chanting and a-preaching. See:
http://www.megalithomania.com/show_site.php?site_id=530
Along with the Carrowmore tombs they could be the roots of stone circles. They could also be related to the Breton half circles and even the half circle at Avebury (but no one's ever considerd that link - the tomb that used to be by the road in the centre of Avebury is very like an Irish wedge tomb too), but people seem to get upset when I propose a theory that goes against Burl's 'Origin of Bits of Avebury is Breton' theory :-)
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