mega-what / prehistoric horizon calendars / Ireland, Co. Sligo, Sligo

Carrowmore Tomb 4: Luni-solar sets

West centred view with luni-solar trajectories c.4000BCE from Carrowmore Passage Tomb, Sligo, Ireland. Much is obscured but the equinox is at the left basal step of Knocknaree, the equinox / cross-quarter midpoint is on the hilltop and summer cross-quarters are on the local top.
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© Michael Wilson.