mega-what / prehistoric horizon calendars / Ireland, Co. Limerick, Galbally

Deerpark Passage Tomb: Luni-solar sets

West centred view with luni-solar trajectories c.3000BCE from Deerpark Passage Tomb, Limerick, Ireland. The equinox is on the slope of the local ridge end, between quarter-month brackets on the top and at the basal intersect. Equinox / summer cross-quarter midpoint is at the right base of a distant hill.
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© Michael Wilson.