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

Carrowmore Tomb 7: Luni-solar rises

East centred view with luni-solar trajectories c.4000BCE from Carrowmore Passage Tomb 7, Sligo, Ireland. The equinox is marked by a hilltop. So is the equinox / winter cross-quarter midpoint but the summer equivalent is at a step. So are the summer cross-quarters but winter ones are in a dip.
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© Michael Wilson.