Avebury: 25th October 2014. 3:01 pm.
Avebury is divided by roads into four quarters. I was walking along the path that runs beside the road, towards 'The Swindon stone' in the north-west quarter. A group of people were holding hands and standing around stone 44 (on this map). At first I thought that it had been 'attacked', that someone had painted the stone using a brush big enough, and paint white enough to cover a garage. I thought that the people were healing the stone... From a distance the graffiti seemed to be like the Ordinance Survey symbol for a church! But then, as the sun went behind a cloud, the image faded... It isn't graffiti. When the sun came out again, the patten looked more like this: Here is a very bad photo. Approximate angles... Hard to judge from this photo At 3 pm the sun is at an azimuth of 227 and the elevation angle is 14.5 degrees. How relevant is this effect of sun on stone? Is it purely accidental and if not how will I be able t...