mega-what / prehistoric horizon calendars / Ireland, West Cork, Bantry

Derreengreanagh Wedge Tomb: Luni-solar sets

West centred view with luni-solar trajectories c.1800BCE from Derreengreanagh Wedge Tomb, Cork, Ireland. The equinox, winter and summer cross-quarters are marked by dips. Equinox / cross-quarter midpoints, both winter and summer are indicated by intersects.
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© Michael Wilson.