mega-what / prehistoric horizon calendars / England, North-East Somerset, Wellow

Stoney Littleton Long Barrow: Luni-solar sets

West centred view with luni-solar trajectories c.3500BCE from Stoney Littleton Long Barrow, Somerset, England. Summer solstice is on a top. The equinox / summer cross-quarter midpoint is on a hump at the hill's base. The equinox is on a slope but subtle undulations mark its quarter and half month brackets.
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© Michael Wilson.