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

Carrowmore Tomb 7: Luni-solar sets

West centred view with luni-solar trajectories c.4000BCE from Carrowmore Passage Tomb 7, Sligo, Ireland. Winter cross-quarters are on a top, summer ones at a dip / step. Equinox / cross-quarter midpoints are on sloping tops but the equinox is less well marked than its quarter and half month brackets.
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© Michael Wilson.