The most definitive summer solstice site identified by Alexander Thom must be the stone row at Ballochroy, North Kintyre. This dramatic stone row sits on the mainland hillside overlooking the Sound of Jura with it's central stone, a large blade or cleit, having it's two long faces clearly aligned on one of the high peaks, Corra Bheinn, on the mountainous island of Jura to the north west. From these stones, at the summer solstice of 1800 BC, (according to Thom's theodolite surveys), the upper limb of the solar disc, at sunset, would first graze the top of Corra Bheinn then slide down the long north flank before settling into the notch at the foot of the mountain. This demonstrates that the...
