mega-what / prehistoric horizon calendars / Ireland, Tipperary

Shrough Passage Tomb: Luni-solar sets

West centred view with luni-solar trajectories c.3000BCE from Shrough Passage Tomb, Tipperary, Ireland. Winter cross-quarters are in a dip but just about everything else is obscured or lost in haze. In the north-west see how nearer hills make useful sub-horizon markers.
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© Michael Wilson.