You may be aware that I built a Long Barrow at All Cannings a couple of years ago. It is aligned to the midwinter Solstice Sunrise, so that the sun shines down the passageway then. This means that at midsummer the solstice sunset is aligned along the Barrow the other way.
Tonight there is a full moon on Solstice evening, the first time since 1967 I believe, so the rising of the full moon should be aligned to the Long Barrow. I will attempt to witness this.
Nearby Adam's Grave neolithic Long Barrow is on the same alignment and the view from it across the Pewsey Vale is spectacular. Might well be worth a visit.